That was really cool!
I think you have a very unique concept here that's enjoyable to play. It's one of those games that's easy to learn but really hard to master. I can see some people playing really fast after some time.
I would suggest to adding controller support and instead of placing platforms free-form to align them more to the grid. That way you can increase the play speed without punishing "bad aim". I think the gameloop of deciding where to place platforms and dodging objects is the main focus, having to aim precisely feels like taking away from the fun of the loop.
Presentation, music and sfx were great!
Awesome submission!