Really amazing game! The concept is brilliant and it is really well polished. I especially liked how the mechanics were taught one by one through the levels. I also loved the visuals, everything looked very cohesive especially the border effect. If I had to nitpick I'd say I would have liked a slightly slower ramp up with some simpler levels at first: the game is quite hard to wrap your head around at first! Really really good job overall though. This is a great game.