Great work on the low poly visuals. I enjoyed the effects quite a bit. I think there's good potential in the concept here! It's like a tower defense game, but more hands on. I think you could expand this idea by having some more strategic elements. I know you have different enemy types that are weaker to certain powers, but the enemies were very small on screen so it was difficult to tell which ones were what. You've got a great idea here, and with some development it would be really fun to play!