I think it's a great idea. Going up the half loop-de-loop was exciting. I got stuck when there is a gap to jump over, couldn't figur it out, although maybe I should have used the hair dryers! It feels like a complete and polished game, the quests especially make it feel like a real game.
Also, on the web version, I had this problem where the UI wouldn't show properly, so I had to download it:
