Interesting framing for the timer to health mechanic, I enjoy sandbox-y arena games with upgrades to keep the player entertained, but the enemies make this one a little awkward as they can attack from bizarre angles and the lack of feedback on taking damage makes it hard to tell you're being hurt or where enemies might be shooting you from. The resolution issues ended up hiding the money on my screen so I wasn't sure what actually causes you to earn money upgrades. With those rectified, it might make for a fairly enjoyable experience given how good the actual FPS controls are!