I enjoyed this a lot, and overall a very polished game - very impressive for a one person team! The art, music and mechanics were all great, and I especially liked the small details like the digging animation for mining.
Think I found a couple of bugs though: a couple of times I got stuck in a loop on digging and after a while the things I was mining didn't seem to add to my inventory anymore. One typo (since you asked) the button on the menu/tutorial screen says "OK, lets!" but I think you mean "OK, let's go!".
Oh, and the beat in the music synching with the head bop and pistons on the forge was brilliant!