I enjoyed and had already rated your game.
Here is my feedback and please don't get me wrong. I have a few suggestions considering that you uploaded it 2 days before the deadline =) so you had some extra time =)
The game could be harder: I kept playing till level 100 and wasnt that hard. You could combine some dash/sprint mechanism as well, faster enemies and stuff
I miss a little the build/rebuild mechanic. It was there, but if the player had to craft things, maybe the game became naturally more challeging
And some day night cycles, sprite animations could make the game more live/dynamic