Did I just enter a horror game at the end, there? o_O Very cool
Whilst simple, this game concept is really nice! I thought I was going crazy in the first level since I couldn't find the difference for the life of me, but each level after that was quite easy. Maybe some sort of difficulty curve could be helpful to lead players in - could also be a cool way to introduce more lore between each level. The story was great and simple art style worked well for the gameplay, and although the highly-contrasted and highly-saturated colours were good for identifying different patterns, it got a bit tough looking so intensely to find the changes. But again, the story and vibe of the game is fantastic and with some 8-bit tunes, you really got something!! Well done :)