This was done solo? Very nicely done for such a short time frame!
Some interesting puzzles and level design, and quite a bit of content too for the timeframe! I have to say though, the one with changing conveyors was a little unclear. Great animation on the little robot!
My main complaint was that there were quite a few areas where I would get stuck on collision geometry. That, and it would have been nicer to move a bit faster sometimes (rolling didn't have as much momentum as I would have expected when I controlled it).
I really like the ending as well! Nice job!