Really fun game. It's quite sad that you have that level bug, I would have loved to see the last two levels. Maybe you can put them up in your page with a text of "these levels are yet unaccessible from the game because of a bug".
I love the big ball mechanic. It just looks a bit weird.
And one more thing that I want to point out, is that I couldn't manage to break the game lol.
I tried shooting the ball out with hyperspeeds, but it never worked. I'm actually impressed by that (by this time, I managed to cheese like 5 games in a row with all types of weird bugs and glitches) :P
Really loved the game... other than the boss... but it was the jam requirement, so I can see why you couldn't do anything else with him.