This was a fun play through.  I feel down a pit in level 2 and couldn't get out so I had to restart from the beginning.

I think it's better to make enemy clone faster and improve player controller a little bit , it will be great competition game...maybe you could even add a clone of yourself after you loose or win , so you have to compete against yourself ...like a ghost system in racing games ,you know?

I liked that you could shoot the yellow slime to slow them down.

cool idea  about the race against another player.  we see the lines on the tile palette square. i think you just need to put  the sprite to point to fix the problem.