A puzzle with shapes that's based on the addictive 2048.
Use the arrow keys or mouse to slide the shapes up, down, left or right and push two shapes of the same type together to combine them, the goal of the game is to create the largest shape possible.
There's 12 different shapes in the game, I've managed to get to the 9th (Dodecagon) myself and think it's pretty hard to get any further.
update: Firefox issue is solved in v0.9.3