Very nice concept, good combinations of logical scaling mechanics alongside platforming.
The art is very nice with good audio, and a well done tutorial system that doesn't break immersion. There's a few bugs and wonky hit boxes in few places but nothing that takes away from the enjoyment.
levels are simple but get the point of the core mechanics across. Perhaps consider a way to manually scroll the screen independently from the character, because its hard to tell what the pressure plates even do when the platforms they control are off screen.
Overall a very pleasant submission with potential to be a great puzzling platformer, and I hope the two slimes get to reunite in the future.
However with the good out of the way I need to bring light to a glaring issue/bug that nearly prevented me from playing the game entirely. When I first tired to play the game, it was stuck with only a black screen and logo. The music was playing and sound effects could be heard when pressing keys. The game's menu was even briefly visible when rapidly stretching the window (aka. the logo splash screen was just stuck instead of fading away). After several minutes of trying things I finally fixed the issue by booting the game in windows 8 compatibility mode. I don't know what could be the issue or why using windows 8 compatibility solved it but thought I should mention it in case anyone else has the same problem, I'm on windows 10 if that makes any difference.