What a game! Nice concept, somewhat trippy. Presentation could use some improvement.
Having Schrödinger's Cat try to escape the box is a fun idea, and taking "roll the dice" to mean quantum superposition is funny. Some criticism follows nevertheless.
- I feel like a true 2D art style would have been better than this semi-3D one. I know you want to tell the player he's in a box, but we can imagine. The 3D effect doesn't look great.
- I know this would require a rebuilding of the game, but I would change how observations happen. Instead of a lever, have the superposition collapse when one of the cats hits the exit or a spike. In the simplest instance in the first level: You have a platform and a spike in blue, and on the blue platform are red spikes and under the blue spikes is the red platform. Make the observation when the red cat lands on the red spikes and the blue cat on the blue platform (This is the orange cat). Instead of pulling the lever and knowing beforehand, the decision if blue or red are correct happens when the red cat hits the spikes. The blue survives because the likelihood of the blue cat is currently greater. Much more fun than with a lever.
Sorry if that last part is obtuse, but that's what you get building a game with quantum effects.
Excited to see what you come up with next!