What's different? The very bottom shows the number of adjacent stones. Look at the first image. 4 green dots are connected and above it says 1/1. This means that there should be only 1 set of 4, and it's been made.
Is this original? I'm not sure. Georgy has another game called Block by_Block which is a clone of an older game called Magic Bricks. Therefore, I must assume that all of his games are clones of others.
Another issue: Why must I have to solve all the 5x5 levels to get to the 6x6? Annoying.