Good concept with a visual style that's simple but works. Gameplay is a bit iffy - movement feels sticky for some reason, and either my game is bugging and booting back to the main menu on a level earlier than it should or none of the levels use the aspect ratio mechanic at all.
As a jam submission, it's not bad at all. With some work to make the gameplay smoother, it could also make a decent small-scale release outside the jam.