It seems like a lot of people had a very similar idea, but brilliant execution really sets this game apart from all the rest. I like how it limits the playing space, so you can really focus on the solving the puzzles and understand how they work instead of mindlessly rolling around and brute-forcing your way through. It also has plenty of additional mechanics to spice up the further levels, compared to other games, which keeps you engaged. Also the amount of said mechanics and levels for 48 hours is truly an amazing feat.