Superbly made little game at this small resolution.
The twist (theme of the game jam) is in your brain: it will make you warm up your neurons.
The best thing is to have really succeeded in bringing together the two great classics that are Tetris and Bejeweled at the same time.
The only thing missing is how to play it at the start. I had a hard time finding the right keys (especially with an azerty keyboard). I finally swapped the A and Q in source code (which allowed me to discover all the available commands at the same time).
Once the discovery of the commands is over, the fun can really begin. Really good job :)