Game does fit the theme, found the splitting to be difficult as it seems to drop one slime on top of the other unless you are holding the arrow keys already. As Ronkad said, figuring out how to split to get over the walls was a bit odd. Is there a different mechanic in mind for that level?
Level 3 was also difficult to work out as I had no way of knowing which parts of the screen would kill me and which I was supposed to fall into. Some indication of the safe spots to change map areas would be helpful.