it's pretty hard, but only due to the randomness of the letters bouncing. i personally found it hard to enjoy, to be honest. maybe if the letters had a more predictable way of moving one could figure out a more established game loop. as it is, the loop is "press spacebar, hit K, hit F5, try again". if there was a quick restart button or if it at least restarted once you get the sequence wrong, maybe i would have tried it for longer than 2 minutes.