It's a good game! Only some small things (could be design choices you made)
Couldn't initially tell that pits were, well, pits. I assumed they were walls. Skill issue on my part? Also found out the hard way you can lose the cart in a pit, lol. But that's part of the challenge, I guess.
Occasionally an enemy spawned right next to me and got in a cheap shot. Not too big of a deal since it only happened like twice!
Pickaxe combat was cool. Got more exciting with the later levels with more pickaxes flying around.
Good stuff man.