Out of all the games so far, this seems pretty fleshed out. I will say that the camera and the aim is a bit too sensitive for my liking. Perhaps adding way to tweak that would be nice. Also you might want to add a free melee option, or multiple weapons, cause you kind of SOL when you are out of bullets.
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Thank you for the feedback! Unfortunately it wasn't mentioned anywhere in the game, but pressing Escape opens a menu that lets you tweak sensitivity. It's also possible to eat bullets by leaping into them or at the cost of losing health, but we didn't make that very clear either. Adding a melee weapon sounds like a cool idea though!