Awesome entry for a 72 hour jam! Like other people have mentioned, the art style and graphics are cute, stylized, and just nice to look at. I love the concept overall.
My biggest complaint is that the platforming in general is pretty clunky. Jumps are jittery, getting to higher places can be incredibly difficult, and some of the spring-boards will bounce you in a misleading direction. I found myself falling off the world often because the jetpack mechanic seems to have varying levels of push-up, making it hard to tell if you have enough fuel to cross a gap.
Something else fairly frustrating was the lack of instructions. I had to guess that shooting the green crystals would remove the shields, and some of the crystals were too hard to reach. Destroying the crystals was also overly difficult because there is no real way to aim the suck-cannon to shoot creatures out. They seem to shoot out in random directions.
I feel like with enough polish, this is something that could look and feel great to play on a console, like the Switch. Overall, excellent work.