I really like the swapping character mechanic, and the visuals help a lot on knowing what do to next. However, the reconstruction part seemed odd to me since there was a piece that was very obvious to fit in some specific place because of the silhoutte and whenever I tried it to get there, it just wouldn't work. Still, a pretty nice puzzle (sorry idk what genre but puzzle seems the closer to it) game.
Oh, I forgot! I also really like the artstyle pretty much and the use of the fish mechanic seems clever to me, using the colors of the fish as indicators of which fish activates certain switch, and the crab habilities and disadvantages are also well-thought.