Okay, first of all. I think this is a super unique idea. Growing a platform to press a button or using a platform to push another platform into the button is something I haven't seen in this jam so far. It's always so cool to see completely different approaches.
The movement feels really great and responsive.
Only imrpovements:
The music is a bit laggy (it sounds like it cuts off here and there).
Try not showing the outside of the levels (more tiles to cover the background would have been better, imo).
Besides that, I think you really have something here, and I am interested to see where this goes. Good job!
PS: What did you use for the lava? A voronoi texture?