As a fan of puzzle games I couldn't resist being intrigued by the game's unique gameplay and also found the hand drawn art style quite appealing. It's kinda hard to explain but basically whenever you go through a doorway the area/room flips, so instead of standing on the floor you would be standing on the ceiling or the side of a wall. The game is inspired by M.C. Escher so that might help you understand it better if you know of his works. You can find the game here: https://nusan.itch.io/fragments-of-euclid
Here's a video I did covering the beginning of the game and also solving the Lone Cube puzzle: