51.2 is an indie platform game with a few twists.
You have to get across each level avoid falls and other dangers.
The twist is that certain areas are made up of some sort of interdimensional substance that can only be walked on when you split into two.
You and your other reality can then move across these areas. Walk into each other to become whole again.
This ads a bit more interest to the gameplay.
Try 51.2 and seehow far you can get.