The game engine is responsible for the performance - we are looking at porting over the game to Unity 5 once the engine is out of Beta so hopefully we can really increase the graphical fidelity and performance. I am currently programming some combat (stealth) mechanics into the game, which will eliminate any need for weapons, the new combat mechanics will include a crosshair and hopefully lock on (for certain weapons). Random deaths have been fixed. The ammo pickup will not be in but there is ways of getting ammo (no spoilers).

-thatotherkid