I really really liked the puzzle mechanics, I think they were very well done and I liked the fact that to solve a puzzle you had not only to think about the screen that you were seeing but also about the screen before or after that.
Like others said the controls were kinda clunky and I think the culprit was that the koi was keeping the inertia, I think you could give a try at removing it, maybe it will be better (probably make the character as a CharacterBody2D instead of a RigidBody2D).
Oh and I also liked the addendum of other mechanics like the clouds and the obstacles that were in the middle of shadows, after that I didn't do much but when I have some more time I'll try to finish it too.
Good job!
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Thank you for playing our game, and appreciate the feedback!
The controls were made a bit slippery by design, we thought a fish kinda moved a bit like this in water? At least we tried mimicking a movement that matched that of a fish in water and also to make the game a bit more challenging!
Glad you enjoyed the level design aspect of it, we had limited assets for the shadow casting so I'm glad it came out alright!
Anyhow thanks for playing the game!
PS: Try to get to the ending, I promise it's worth it! :)