Playing this game was a great and fun experience. The music was great and fits. Art is awesome. I like it.
It was simple but it has a few puzzle here and there. And because of the theme you should not forget that everything is a lie. Like when you know what x = -2.5f is and think nice I know which door the game means. But still you should remember the theme. You could probably add more and also trickier puzzles if you decide to expand on the project.
When you finish a game once the world should change a bit, like adding more objects (at least just to interact with them) or adding something else that would change the next playthrough, so that you want to play again and see more.
And maybe the "game over"-doors should have some different outcomes in form of text or image. Like here it is game over because this happened, and so on.
Overall a great game. If you decide to work on it and make it a bigger project, I would like to play it :)