Wow, just wow. Really well polished and the idea is expertly executed in my opinion. The rules all make sense and nothing feels arbitrary. The last two sections of level 5 were a real brain buster but genuinely a joy to solve. I'm really amazed at how much you've squeezed out of this and to think we both had the same timeframe to make a game. The idea is properly fleshed out and new mechanics are slowly introduced to spice things up. I could see this being a commercial release with only a few minor touch ups.