Amazing reinvention of Tetris!
 I have to change my opinion, from 5 stars to 2.5 stars. For one simple reason: The 'random' appearances of the locks doesn't seem to be random at all, it's the opposite, it seems like they appear directly at the places you don't want them to appear to. There are like 20 free spaces, and EVERY SINGLE TIME it appears in the one space that makes you lose a level. If it weren't for that, i would indeed call this amazing, but not it's "It's okay, could be better"
Frustration features are NEVER a good practice in games