The Roblets are cute, and I felt bad scarping them. You did a good job giving them personality. Chunky and Peppy were close enough in color and shape as to sometimes make it hard to tell them apart when moving quickly. I think it would have been beneficial if there had been a greater color contrast between those to shapes.
The SFX felt pretty loud compared to the background music. I turned my volume up before starting to hear the music, but had to turn it back down to handle the SFX. It would have been nice if they had been balanced better or if you had given an option for manually setting each one.
The level progression felt decent. I liked that in the last two levels the conveyor belts could switch directions as well as shapes. It allowed for an additional challenged without needing to increase the speed or add another belt.