I found ur game interesting and with original idea, but the implemetation of mechanics of your game deserves to be better.
- 3 seconds is very little amount of time to pass the level, because u r just don't have enough time to ketch what u r seeing on the screne.
- My suggestion is to start timer(3 seconds) only when player has made the first move.
- and also you can press "RETRY" with your mouse, but then u need to switch to your keyboard, but timer has been already started.