My feedback for NATAИ:
What your game does well:
The core mechanic ties with the theme 'inside out' really well. My first time switching layers was my favorite 'wow' moment of the game
The jumping and movement feels good. A great way that you built on your players' core actions was to combine switching layers with jumping to build more momentum.
The visuals are simple and also have the function of inverting themselves. You were also able to teach the player how to play through your level design.
What the game doesn't do well:
The character jump doesn't have any noticeable Coyote time. In general that's not a requirement for any platformer, but I definitely felt cheated out of my jump at times in this one.
After the first 5 or so levels, aside from the lasers, the gameplay got stale. Each level required the same things of the player. They didn't get more difficult, nor did they introduce much new.
Areas of Opportunity:
I may have my criticisms, but I'm still keeping in mind we had 9 days to make our game. For things that this game lacks, you did do a tremendous job of developing an MVP and can certainly continue to iterate it. The game has a lot of potential to be something bigger and better.
There's potential with making more levels revolving around your jump switching (I noticed one at the end). Taking it a step further, there are opportunities to make obstacles that also affect jump switching (like gravity, wind, and/or time manipulation).
I hope this feedback helps!