it got me several attempts at level 3 and several reads of the instructions to finally understand what is was about. but it feels like a genius idea now! I see this is a prototype so the lack of graphic indicators is understandable, but what I would really recommend is to get rid of the timer, I don't think it adds much to the game, unless you're planning some actual time-based challenges, otherwise it can be somewhat distracting from figuring out the puzzle. anyway great job on the idea!