Pretty fun gameplay. Surprisingly easy to control the ball. Of the problems I had, if any, is that I got really confused in the beginning. I think the starting area is too big and samey, so you can get lost easily. It took me a while to realise I was supposed to jump over the blue fence.
Also, I'll confess I don't really understand the sleeping part. The hamster is making sleeping particles, but his eyes are open? LOL. And I'm not really sure what those floating Z's all over the stage are supposed to be, either.
By the way, seems like the mouse didn't lock to the screen for some people, but it worked just fine on my browser.
Anyways, good game. Congratulations, from your 100th reviewer.