There is plenty to think about, balance-wise, for a game as complex as this. I think I'm going to change the experience curves and formulas so 30 kills of one enemy will be the max needed to get all the experience that enemy can give. I'll have to think about the other ways to split 30 experience - as stronger enemies wont require as many kills. Or maybe they could? It's a thing to think about.
Now I'm at a challenge where you have to dodge flames coming from the ground for 45 seconds. So far I haven't been able to actually beat the challenge, so I might try and make it easier still, or just try again until I get it and see if it's actually fun as-is.
Currently working on: Continuing the story
Time spent on the project so far: 150 hours
Screenshot after the jump: Dodge the fire!