I like the timed commands. I'm not an enormous fan of the interface for them; clicking would work if it was tapping, but binding 1/2/3 to them would help. That would allow people to speed up their gameplay, as well. Those boxes could be in the UI layer, definitely. Which would give you a little more control over their locations / appearance. Gameplay was a little slow for me; it seemed that you had a few options (sacrifice life for mana, use mana to heal, do lots of damage at once, block, evade) that were worth a TON more than the others. Overall I consider it a cool concept and if you built the blocks into a deck-like mechanic it could become a really cool game.