Thanks a bunch! Glad you like it, and to hear that it plays well enough!
I did notice the corner collisions, but it was a bug I couldn't figure out how to deal with in time. At least it's relatively minor, though.
Personally, I thought up and down worked fine for the ball, but a friend suggested including a button for it as well. If the ball button gets in the way, though, you could just re-map it somewhere else. I'm finding there's a lot of different preferences for how a mechanic like this should be controlled. It's pretty interesting to learn!