Really good - but very hard! It'd be nice to have the ability to see what the full picture is supposed to look like (e.g. when you're doing a number sliding puzzle, you know the order the numbers are *supposed* to be)
Edit: I missed the fact you have a Hint section with just that
One little piece of feedback - it's a bit hard to read the indicated combo buttons, especially some of the arrows. I would make them a bit bigger to be able to distinguish them.
I really liked the laser beam mechanic, though it seemed to run out very quickly! There's definitely potential here, and the visuals are nice and clean
Clever! It's a bit too hard for me, but that might be because I have a split keyboard that's not conducive to arrow keys. Good looking sprites, clever concept
Nice! I sometimes got mixed up with which direction was which, but noticed later the A and D were under the platform as well, which helped. Slick presentation, nice aesthetic
I don't think the bubbles hurt the enemies at all - you have to use the bubbles to push cannonballs into the planes, or just hope the slow moving cannonball hits them
Yeahhh the timing is really too fickle (you have to already be sitting on the right lane at the instant the beat changes, even if visually you were there a fraction of a second early/later).
That would definitely be an improvement I'd make with a bit more time
