A Fun mechanic idea, but could really have benefitted from some more diverse/interesting levels. Right now it just feels like we have a duplicate player, instead of controlling two separate slimes. By creating two different layouts in each level you could create some interesting puzzles, instead of just having one puzzle which is duplicated.
The game’s levels currently feel like the introductory levels of a puzzle game, which introduce the mechanics but then after 3 levels it already ends.