I always like a good puzzle game! I'm getting strong Loki vibes from this :). The concept here is really neat, and you designed some interesting levels to show it off. I like that you didn't just stick to something basic like button pressing, and instead added little stories, it's a great little touch.
Additional feedback on codes and some sound effects would help the game-feel a bit but I get that time constraints make this stuff hard to prioritise. Also it's possible to collect multiple of the same code, so perhaps consider adding something that prevents you filling the screen with identical codes. Listing the codes on screen is a nice touch though, you could maybe go even further and have the codes enter automatically which might help the ease of play a bit.
Overall this is a unique concept, and you executed on it well, producing a really fun little game. Great job!