Nice game! Was really fun! But, a major issue is that the time where you can see the walls is way too short. Maybe let the player decide when the walls hide? Another thing was that the timer was way too short, so in the last level a single memory mistake can ruin your whole run, maybe add 2-4 seconds to the timer, but apart that I think that this game is a pretty cool and neat small game! With a few tweaks, this could be a great game on the mobile market! Keep up the good work!