This is cute and neat. I did find the balance between fish a bit off (the red fish carried me through most of it). It might be cool to explore larger levels that require a combination of fish. (I also ran into the bugs reported earlier: the controls did not always work for a new fish and the hover fish seemed to just stick in place.)
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Thanks for the feedback! I'll need to have a word with the red fish and let it know to stop hogging the spotlight, definitely a shared opinion.
I love the idea of some larger levels with a diverse range of obstacles that forces the player to switch fish; I don't think there's any need to use metamorphafish currently.