Very cool mechanic being able to split into multiple parts and using the other slimes as a distraction/cover to get past obstacles. I think you could make more use of the switching to another slime at death mechanic, like using your main slime to distract an enemy and then switching to a safe slime to escape. The tutorial is cool but can be skipped over without reading by just going through the exit doors (especially the one showing the shooter and scale modifier, as you start right next to the door), so maybe making it so the player has to get past one of each enemy type in each tutorial room before they can reach the door is a good idea? The fire rate of shooters is too high in my opinion and can be a bit too punishing in some areas. I think the concept is pretty cool and could definitely be expanded upon, nice work!