Really creative idea for gameplay that fits the theme. It does feel like I'm just being thrown into the deep end of the gameplay though without much of a ramp up to explain the game mechanics. It would have been nice to at least have a how to play screen, or a how to play section in the description. For instance, how do you collect the collectibles like the 1-ups. I know there are explanations for a lot of things on the screen when the gameplay starts, but things are small and not where the actual gameplay is happening, also, things are not fully explained. I figured it things out eventually, but definitely felt pretty overwhelmed at first.
As some others have mentioned, while the visuals are great, it's hard to agree that this game sticks to the limited shape requirements. Which is a shame that will mean your jam rating won't be as high as they could've been had this jam not used the shape requirements.
Good job to you and your team!