MOVEMENT:
Move your block with cursor keys, up to jump.
Use space to switch to 'connect mode' (see below)
This time i had no idea what to do with the theme after hours of diddling this is what came out, don't judge me, next time will be better.
When collecting gems you get points.
When you collect small orange blocks you get an extra live with which you can create a 'connected' block which will help you next incarnation to reach places that were otherwise unreachable (just jump and press space while in air, on contact with the level the player will become a block himself).
So, start connecting...