I really love this game. It's such a simple concept but the level design makes playing an absolute blast. The music selection is great as well and I don't think the game would be nearly as fun without it. Simple controls and minimalist presentation means an international audience can enjoy this on many different platforms. Also of note is the fact that some levels can be completed much more easily if the player is clever enough (it's a good feeling).
Anyways, I made it to level 70 or something and gave up. I had hoped to come back later to finish the game but I found out my level data wasn't saved which is a real bummer. I guess HTML5 games store their data in cookies? I set my browser, Mozilla Firefox, to clear cookies upon close. Gah, I'm too used to Flash and its offline cache.
I haven't played many HTML5 games but this is the best I've played so far. HTML has certainly come a long way. Thanks for making this.