I really like how this game looks, the menus look cool, but how do you forget the default controls you set yourself? It needs some more time in the oven, but has great potential.
The music gets pretty repetitive so i couldn't see myself playing too long. it would be cool if it changed up a little after getting to a new epoch. Also, some of the sounds peak a lot and become really loud and unpleasant, but otherwise i like the sounds you picked for pickups.
Also please fix explosives spawning on top of you at the beginning of the wave