Hi guys, thanks for your comments.
Orangy Tang, I will definitely add more levels. I'm letting my brain recover for a bit, then I'm gonna carry on, and I intend for there to be plenty of levels and puzzles eventually.
philomory, thanks for you comments - that swatting action would definitely be more self explanatory with some slick audio and animation, and if the enemies flew in directions other than 225(?) degrees :0
mintman, I like the gestures idea! I'm still not using the left mouse button so that could be a sort of gesture mode trigger. A more abstract environment would also be very interesting, but I think if I really managed to convey a puppet-like hero, with more cartoony/dungeon keeper silliness, that setting/style might be fantastic.
LiquidAsh, thanks for the comment, much appreciated. Re: Enemies through walls - I ran out of time there, sadly, but I did see someone else here talking about making his enemies ghosts, and the thought crossed my mind :P