See Depths of Sanity in vid form, watch here.
"A mysterious signal. A missing crew. And the one man trying to piece it all together. As Abe Douglas, dive deep into a fully underwater metroidvania to explore massive oceanic biomes, battle monstrous bosses, and piece together a mystery that threatens not only your crew, but your own sanity."
At a glance categories:
Metroidvania, Underwater, Lovecraftian