I suggest to add multiplayer. At least a way to play with your friends hosting a server in lan.
In my opinion survival games are boring without other player.
And just another thing: I know that you placed a "read me" with "controls key" in the folder but if you add a mini-tutorial (at least a starting box in the upper part of the screen showing controls) would be great (when i started to play i didn't see the txt and for 10 minutes i pressed random keys, surely this is happend to others "distracted" players XD).
However the game is great, simple but enjoyable and this is his role and aim of life (Don't add dispersive thing but only essential stuffs *always in my opinion*.)
Last one: Try to propose this game in "steam greenlight" (this game is better than many games accepted on steam so you can have a bit profit)