This game is FUN!
After you get the jump mechanic it is great!
The programming part seems interesting. But as others mentioned, it is not clear how to use it.
I believe that affects when the Key Change. Is this how it works?
As I did not add nothing to the first screen, when the Key Change to me, I pressed all keys and could not find it how to continue moving. Not sure it is related to the first screen.
Interesting concept!
I enjoyed the art and interesting concept. The turtle was not progressing through the level, so I was using the bullets to push it to a direction, eventually it ran out of bullet and it was killed by the enemies.
Maybe if you a cool thing to add would be a button for the turtle to change direction (random direction), would give a little bit of "control" to the player.