Not reward yet for collectibles. I was thinking in unlock new episodes if you have enough diamonds...
No keyboard shortcut. The game was designed for touch screen, though i am not planning to release it to the Google playstore.
You are right! 1-7 has more gems. My mistake, sorry! The other bug i found too late Is to let movement to the player in the intro scene, the one with the house. That was not supposed to happen.
Maybe i could make the key animation faster...no way to skipp it though.