Really cool game. I like the mana and ability system and I think with a few more abilities and refining could make it even better. For adjusting the difficulty, maybe you could adjust how many different colors there were (fewer colors would create more possible matches and more difficulty, while more colors would create fewer possible matches and a lower difficulty).
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Thanks for the suggestions! For the difficulty, this is something I noticed as well. I actually needed to add an extra color early on, because it was really difficult at first with all the possible matches. I agree some tuning and more abilities will make it so much better! I wanted to add the normal match 3 power-ups (directional bombs, etc.) but ran out of time.