I made it to level 12, I think, when I mostly stopped using the boost button. The game over screen is unsatisfying, it would be fine if you added a "Best Run" indicator on the main screen. You'll want to do global high scores eventually too.

Yeah, we'll be doing global high scores, and also stuff like challange a friend over Facebook etc. Just have to write the site next, as well as work on the next game! I think I'll put the last high score and best high score on the main menu tomorrow though, that's a good idea for the short term.