i feel like you should add more building materials, such as doors, new textures of blocks, etc. also a few new types of enemies to spice things up. not too fun to see the same red eyes staring for you every couple of seconds. still, its a fun game and i play it daily. keep up the good work!
i just accidentally saved a 30 minute game on a 2 hour game accidentally :I
one feature that could improve the game is to make it so it asks "are you sure?" or something before saving. could help other people in the future
i found a life reserve upgrade on the 2nd level, but i barely noticed the value of it. like man,many comments suggested you really need to lose less health when you get hit. otherwise this is an awesome game