Thanks for responding, that's a fair comment on the controls :) It was kinda where you introduced the controls with a jump which was kind of useless in that stage, it might be worth holding that one back and bringing it in later when jump is actually usable :)
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Exactly, when you are an evolved fish, you can dive using down key, but it's the only time (at this point) when the down button is used.
Before being an evolved fish you just had to wait for gravity to take you down.
I hope you want to play it later on when i polish the game and upload a new version.
Thank you again,