A little buggy, but not bad.
It's was okay, but nothing memorable. The blue square as the character was dull, you could have made it an actual character of some sort.
One major flaw: When I went to the second level, it superimposed it over one of the menu screens, which made an unplayable mess.
The game engine was good and felt solid, though sometimes the floor blew away enough that collecting a star that happened to materialize in the qrong spot meant committing suicide. And it's possible to jump through the ceiling and walk on top of the level, like the second level in Super Mario Bros.
You can do better. :D