The music is cute. The sound effects are cute. I like the glowy-shiny buttons.
The art is not bad.. however... the game is strangely pixelated, but not as if it was purposely done so... it's not like it's "retro" or a "pixel" game. That confuses me. Seems lower quality because of it.
The concept is strange. A monster or ghost... becoming a balloon and then transforming back into a monster? Hmmmmm. Not sure if I like that idea or not. The person being a ball... that was weird too. That is a pretty original concept, even though the type of game is not original. Hmmm...
Overall though, it was a playable, somewhat entertaining game.
4/5 5 stars would require better graphics in terms of less pixelated art. I think that offering medals always helps a game's cause too... but I'm a medal addict, and I'm not afraid to admit that. :)
Pretty good job!