Wow! I've seen a few FPS games in past jams but this one certainly takes the cake for authenticity in terms of feeling like a retro shooter, playing as a gun-wielding 'cool guy' who has a goal, but is really just a stand in for shooting enemies, it honestly never get's old and it makes for a really fun game! The controls are responsive, and everything mixes really well together.
One of the biggest advantages of the game, the really cool looking atmosphere and graphics that fit into the 64x64 canvas, is also one of it's greatest flaws in my opinion. This game did start to give me a slight headache after playing it for a bit, and I think it's because of how jumbled the pixels can get. You used rather high resolution textures, (In relation to the resolution of the game,) And while it gives the game a refined and unique look, it also makes it hard to play in some instances because the detail blends together. But, this really can't be avoided given the restrictions, you would either need to simplify the textures, add more fog, or some other similar massive change to it's atmosphere, and for what it is and what it does, I think this is great!