The Sinking City (video game)

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https://www.thesinkingcity.com/en

From the page:

Plunge into insanity

“We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far.” - H.P. Lovecraft, The Call of Cthulhu

The Sinking City is an action/investigation game set in an open world inspired by the universe of H.P. Lovecraft. In this new type of adventure, you take on the role of Charles W. Reed, an investigator in the 1920s United States. No sooner have you arrived in Oakmont, Massachusetts, than you are led to investigate a mysterious flood inundating the city, in the hopes of shedding light on the darkness that has seized the place and corrupted the minds of the inhabitants - and yours...