Close the strait !

The strait is narrow. The oil routes are vital. And the enemy is already on the horizon.

You command the defenses of a strategically critical maritime passage—the lifeline of your nation’s economy. Every tanker that crosses these waters carries precious oil, and every barrel that reaches safety strengthens your war effort.

But the strait has become a hunting ground.

Pirate fleets, raiders, submarines, aircraft, and increasingly powerful enemy formations are moving in to seize your resources and break your defenses.

Your mission is simple:

Protect the oil. Hold the coastline. Close the strait.

BUILD YOUR DEFENSE

Every operation begins with limited resources and an exposed coastline.

Deploy machine-gun positions, anti-ship batteries, missile systems, radar installations, anti-air defenses, artillery, mines, and fortified positions across strategically important locations.

But static defenses are only the beginning.

As the battle escalates, you'll gain access to a growing military arsenal:

• Tanks & Armored Units — Reinforce vulnerable positions and intercept enemy landings.

• Aircraft — Launch fighters, interceptors, bombers, and strike missions against incoming threats.

• Naval Forces — Deploy patrol boats, missile craft, destroyers, and other vessels to control the waters.

• Submarines — Hunt enemy fleets from beneath the surface and strike before they reach your defenses.

• Radar & Reconnaissance — Detect distant threats and give your defenses the information they need to respond.

• Missile & Artillery Systems — Destroy high-value targets before they can reach the strait.

Every unit has a purpose.

Every emplacement matters.

And every weakness in your defensive network will eventually be tested.

DETECT. IDENTIFY. DESTROY.

Firepower means nothing if you cannot see the enemy coming.

Build a network of radars, reconnaissance systems, observation posts, and detection equipment to expand your battlefield awareness.

Enemy aircraft can approach from beyond the horizon. Submarines can slip beneath your defenses. Fast attack boats can exploit gaps in your coverage.

Different threats demand different answers.

A radar station might detect an incoming bomber formation—but you'll still need the ammunition and weapons capable of bringing it down.

A sonar system might reveal a submarine—but detecting it and destroying it are two very different problems.

As the enemy grows stronger, building the right combination of detection, range, firepower, ammunition, and support systems becomes the difference between holding the strait and watching your defenses collapse.

CHOOSE YOUR ARSENAL

Your defenses can be developed through multiple upgrade trees, allowing each campaign to evolve differently.

Improve firing range.

Increase radar coverage.

Unlock heavier ammunition.

Upgrade missile guidance.

Strengthen armor.

Increase aircraft capabilities.

Improve naval weapons.

Develop more advanced technologies.

Some upgrades provide immediate power. Others open entirely new branches of military technology.

There is no single perfect defense.

Experiment with different combinations, adapt to the threats you're facing, and build a military machine capable of surviving increasingly overwhelming attacks.

FAILURE IS PART OF THE WAR

You will lose.

Your defenses will collapse. Enemy forces will break through. Oil will be stolen. Positions you thought were untouchable will be destroyed.

But defeat is not the end.

It is progression.

Close the Strait is an incremental tower-defense roguelite built around repeated attempts.

Every operation earns resources that remain with you after defeat. Spend them on permanent upgrades, unlock new military technology, improve your starting capabilities, and return to the battlefield stronger than before.

A level that once seemed impossible slowly becomes manageable.

Then beatable.

Then yours.

Fight. Lose. Upgrade. Return.

Push further with every attempt until you finally break the enemy offensive and secure the strait.

Victory unlocks the next operation—bringing new terrain, new enemies, new tactical problems, and even greater threats.

TWO POWERS. TWO DOCTRINES.

The world is divided between two rival military blocs locked in a decades-long struggle for influence.

Choose your allegiance.

THE MERIDIAN COMPACT

A technologically sophisticated alliance built around precision warfare, advanced electronics, powerful air forces, and highly coordinated defensive systems.

Their equipment favors accuracy, intelligence, radar superiority, guided weapons, and specialized units.

Expensive.

Precise.

Deadly.

THE VOSTRA UNION

A massive continental military coalition built around industrial power, heavy armor, overwhelming firepower, and weapons designed to keep fighting under brutal conditions.

Their doctrine favors durability, artillery, armored formations, mass deployment, and raw destructive power.

Heavy.

Relentless.

Unforgiving.

Both factions can defend the strait—but they approach war very differently.

Their units, technologies, upgrade paths, strengths, and weaknesses change how you build your defenses and how you respond to the enemy.

EVERY WAVE CHANGES THE BATTLE

The enemy will not simply send more of the same.

Early attacks might consist of poorly equipped raiders and small boats attempting to steal oil and escape.

Survive long enough and the battlefield escalates.

Fast attack craft begin probing your coastline.

Aircraft attack your radar network.

Armored landing forces attempt to establish positions on shore.

Submarines move beneath your naval defenses.

Heavily armed ships appear beyond the horizon.

Eventually, your carefully constructed defensive network becomes a battlefield spanning land, sea, and air.

The question is no longer whether the enemy is coming.

It's whether you built the right defenses before they arrive.

CONTROL THE STRAIT

Every barrel matters.

Oil fuels your economy, your military, and your ability to continue the war.

Protect tankers and strategic infrastructure while deciding how aggressively to invest your resources. Spend heavily on defenses now, or save for a powerful technology upgrade that could transform your next attempt.

Build too slowly and the enemy may overwhelm you.

Expand too quickly and you may find yourself without the ammunition or resources needed to survive the next assault.

Every operation becomes a balancing act between survival, expansion, technology, and firepower.

ADAPT. UPGRADE. OVERCOME.

Close the Strait combines the satisfaction of incremental progression with the strategic decisions of tower defense and modern warfare RTS games.

Build interconnected defenses.

Deploy land, naval, and air units.

Establish radar coverage.

Manage different ammunition and weapon systems.

Explore branching technology trees.

Experiment with different military doctrines.

Lose battles and turn those defeats into permanent strength.

Then return and try again.

The enemy only needs to break through once.

You need to make sure they never do.

Defend the oil.

Control the waters.

Close the Strait.