I like the Katamari Damacy space ball idea. I think the rock density may be too low. I spent a lot of time waiting to see something big enough to slingshot off of. Late game is also pretty taxing on frames per second. I got down to 3fps before I had to give up. I imagine there is a bunch of tiny rocks that are too small to see taking up compute resources. Maybe these can be cleared based on how large the player is.