Very fun! I had a lot of fun finding the secrets and various shortcuts. A speed-run timer for individual levels would be nice (maybe except for "L"?).
A few bugs:
shooting the laser straight down (to the pixel) causes the player to turn around for 1 to 2 frames.
Jumping into fast moving platforms (like in secret rooms 1 and 3 and the first elevator in the space transition) usually kills the player.
The screen transition in Lifting Motion can be jumped over with the laser and there's a missing screen transition if the player attempts to re-enter secret room 3.