Though I like the idea of revitalising a wasteland, I could essentially not get anywhere. Perhaps I'm missing a key mechanic? The enemies spawn so quickly and my attack is so slow that I end up almost never killing any of them (unless I go in straight lines, which tends to get me killed). You note "a good build order" below, but I'm not even getting to a point where I can build things.
I would have liked to see some more feedback and information in the game (presumably a victim of jam time limits?); not knowing how much HP I have left, whether I've been hit, or how many bones I have really helped to compound the feelings of frustration, which is probably not what you had in mind.
Overall, I like the concept of this game, but I can't get to a point where I can see the results of that concept.