Kind of unrelated, but dolphins and aliens remind me so much of Ecco the Dolphin for the Sega Genesis, one of the most unsettling games I've ever played.

I recently found a video explaining the inspiration behind the game, which is messed up in its own way too, completely related to the LSD experiments someone else mentioned in the comments: https://www.youtube.com/watch?v=0xUvhUK8Dv8