I think the rocket platform idea is awesome. The concept of jumping on platforms and creating them at the same time is just really cool to think about. It is pretty hard to jump on those tiny platforms though, even though the movement feels pretty tight already.
The combat is really neat, as I mentioned in the Discord, I love being able to shoot an enemy, watching where the blast puts it, and then lead the next shot based on where I think the enemy will land. If you've ever played Pharah in Overwatch, it's like shooting your Concussive Blast at an enemy, seeing where they're headed, then hitting them with a direct hit because you know exactly where they'll be.
Awesome submission with a clever take on the theme.