Good concept.
When I started, I liked it enough. One level... two levels... three levels... but then there was no more time and when I lost, I got sent back to the first level. Above all, that is annoying. Besides that, its a bit too hard on the first levels if there are all that many more afterward and like the others said, its incredibly slow. It wouldn't be so bad getting sent back to the first level if it weren't for how long it takes to get to level 3 or 8 what have you. I got pretty frustrated and had it not reset to the first level, I would have given it at least 8 stars instead of 5.