Here's a suggestion.. for the half hour reward, it'd be nice if you changed it so that the box doesn't pop up in the middle of the screen and block off most of it. A couple times now I've been playing the snail game and that gets in my way. Maybe just make it a small flashing box at the top that we can click to see our reward instead?
I like the reverse psychology he's using to try and get a high rating. Telling us to rate 1, thinking we'd disobey him and give him a 5 instead. Well, I'll listen :) 1 it is.
Found a little glitch... before the first boss you have unlimited bombs, making it very easy to kill... well, everyone. Might wanna fix that. :) Aside from that, great game, 4/5