Really nice arcady battle system!
Very easy to get in to and follow what's going on, which is very difficult to do.
The core mechanics has alot of potential. Could possibly be mixed with a dungeon crawler overworld, where this is the battle mechanics when encountering monsters. I like the minimalist style, but would not personally mind some more visual stimuli going on. Worth experimenting with.
Found it too easy to beat the game, but maybe it was random luck. :p
Well done!