Could have been better.
You should have thoroughly tested it before submitting. The "Upgrade" button is extremely exploitable and the "Special Attack" button is broken.
The backgrounds are plain and uninteresting, and the music is pointless (Considering fights last maybe 3 seconds). The plain grey background gives it a dull feeling, and the fight background looks rushed.
There's no real variety of anything. Same enemy, over and over and over. Same background. Same attacks. It gets extremely boring, fast.
Sorry if this seems harsh, but it's criticism. It can be much better, but this version just isn't doing it. Please don't use time as an excuse, I'm sure people can wait for more then "a day later".