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Gameplay
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Q3 2026·Bakuevo·
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You are caffeine. A high-velocity roguelite FPS through a human bloodstream. Your survival timer only refills by killing — stop and you're metabolized. Every kill makes you faster. Every run rolls new weapons and upgrades. Reach the brain before he falls asleep.

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About MAINLINE

KILL TO BUY TIME

An unbroken kill chain and absolute speed — a super-adrenaline-max roguelite FPS. You are caffeine. Injected into the arm of a human running on empty. Reach the brain before you are metabolized, and wake him up.

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STOP AND YOU DIE

Your survival timer drains without pause. The only way to refill it is to kill. Taking a hit drains it further. There is no bar on screen. Only the vignette closing in and your heartbeat speeding up tell you how much is left. Don't want to be metabolized? Kill.

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THE MORE YOU KILL, THE FASTER YOU GO

You never stop moving forward. Strafe along the vessel wall — slip past incoming fire and the clots blocking your path. Kill. Your timer extends. Your speed climbs. On to the next one. Keep killing and the boost stacks, your view widens, the speed lines stretch out. Every enemy carries a weak point inside its body. Finish one through the weak point and your magazine comes back whole.

NO TWO RUNS ARE THE SAME

Clear a stage, then take one of three cards. Swap your gun, or upgrade the one you have. You carry exactly one gun. MAIN WEAPONS

ADENOSINE ASSAULT
HELIX SHOTGUN
PLATELET SMG
AXON LASER
TRIPLE-DOSE RIFLE

SPECIAL WEAPONS

CAFFEINE BOMB
ADRENALINE LASER
BRADYCARDIA
CAFFEINE RUSH
PLATELET SHIELD

Magazine size, damage, fire rate, reload. Upgrades keep stacking even when you switch guns.

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FROM VEIN TO BRAIN

Peripheral vein, heart, lung, aorta, blood-brain barrier, and the brain itself. Six chapters wear the colour of the blood, shifting from dark venous red to the electric hue of nerves. Adenosine receptors block the way. Platelet walls your rounds cannot pass. Clot lasers sweeping the vessel. At the end of every chapter, a mutant guards the gate to the organ. Fall and you restart the chapter. Every upgrade you stacked, every gun you held — wiped.

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BEFORE HE FALLS ASLEEP

Die on the way and you are simply metabolized and gone. But bursting apart the moment you reach the brain — that, and only that, is victory. Get there before he falls asleep, and wake his brain.

STREAMING AND VIDEO

Streams, videos, whatever you want. Monetization included. Put one link to this store page in your description — that is the next injection. Appreciated. Note: This game makes heavy use of flashing lights, strobing and sudden colour inversion. Players with a history of photosensitive epilepsy should take care.

Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.

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