Roll The Dice is hard because I am bad at it XDDD
The checkpoint should not be placed where the enemies pass by too. (Roll The Dice, Back to the Reality)
TERRRYYY! is awesome.
There should be a checkpoint at the start of Beep Beep, and somewhere in between it too. That is way too long of a distance without checkpoints.
The conveyors part is quite hard in Beep Beep.
You should try to avoid using single-tiled wall.
Quite a neat level overall though.