I've put in 2 alternate control schemes with the arrow keys used for movement by default. I decided to keep 2 keys for swapping elves, but you may use only 1 if you prefer.
Shooting has been enabled, but it is very buggy - it only fires horizontally, and the baubles appear away from the end of the gun. Also, you run out after 64 of them, and the debug view is visible - I ran out of time. These errors WILL be fixed tomorrow.
The chimney problem will be solved in a later update, though some will argue the end result will make the game too easy, extra points will be awarded for accuracy.
I'll add the moving stars too, that's a good idea.