This is cool. Not bad at all! Some more "feedback" would be good, to show when you actually do things. That would make it much less confusing to pick up. Especially with the guys so small, it's pretty hard to tell if anything happened or not. I like how some of the different monsters do random little things on their own, like the upgraded spiders spawning more, etc. I like the idea of filling up a cave with "essence" and letting stuff grow out of that.