BULLETHEART is a fast-paced, adrenaline-pumping, first-person movement shooter where your ammo is tied to the level's enemy count. Use smooth movement and precise aim to progress. But be careful, you can only take one shot before dying. Complete the level by learning its layout and by planning with subsequent attempts.

Enhance yourself with randomized upgrades, max out your overdrive meter quickly enough to unlock a destructive skill to use against enemies, and take advantage of basic movement mechanics like dashing, sliding, and double-jumping complimented by more flashy combat mechanics.