There is something of a level-system in it and that's what I like, also I just have to say I really like the looks of mr mothball (and the rest of the game as well)
I really like the looks of it, only it is a bit short (of course) so you might want to add a level-system with a minimum score in that level or something because like this people aren't going to play the game again because there is just no goal (here on Kongregate there isn't even a score list, though I'm not sure if that's your fault or Kong's fault).