This was really interesting, I'd be really interested in playing a more polished version! I can really see the potential of the movement mechanics and with some tweaking it could enable some really interesting game play. When I started gaining speed to slingshot myself I felt like the game wasn't quite doing what I wanted and I would start growing out from blocks at a different angle that I wanted to go so I think that would be the main thing to focus on. Great work, I had fun!