Thank you all for your feedback -- I'm so happy you enjoy it! Kl'Dck Hul is right, I originally made BUB for the Gamebuino. :^) I'll have to look into that Ogiri contest. Thanks everyone!
I would suggest adding a delay before boxes are pushed. It's kinda annoying on some stages to make a bad move by just touching a box at the wrong moment.
Also 12-2 seems harder than 12-4
Thanks for the feedback, pirate! A slight delay before slurping up a bubble or bumping a crate is probably a good idea. I'm sure I'll do some more with BUB at some point, so I'll keep that in mind. It's tricky to put stuff in exactly easiest-to-hardest order, but you're right, 12-4 isn't terribly devious. :^)
Something weird I'd like to point out. Bub is able to delete a one way sign by spiting out a Bubble on it, not sure if this is intentional or not.
BTW, I love the course creator.