ok, this is very clever! i've never seen a control scheme like this before, and as such, yes, it took a minute to figure out what was going on, and some instructions might have helped (yes, i read your description that you left them out intentionally, i get it, but..). still, you pick it up pretty quick just by experimenting. (could perhaps benefit from just alternative symbols - the "X" and "%" are perhaps the least intuitive for velocity scaling, ^v for shrink/grow maybe could be a circle with inward/outward arrows at four corners, etc - fwiw, just ideas). might also help if you could touch/drag *anywhere* on screen to slide the controls (so you don't cover them up w finger). and i'd say you could have gotten away with keeping an entirely monochrome theme (didn't need blue/yellow color on ball/star) just for "style points". anyway, none of the above are "complaints", just ideas for you, it's well-done as is.