Thanks! The blue ability, the ice gem, stops time. This lets you both take out enemies easier as well as max your heal cooldown so you can regen after you unfreeze. I will admit I should have made it more obvious. The difficulty is definitely something that I should have tweaked as well. Half of the time when I was playing even I couldn't complete the levels. I'll be sure not to make it impossible when I release a more complete version of the game.