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I agree with Forbidden Gateway and the Call of Cthulhu solo adventures. You may also want to try the Diceman interactive comic book series, which has a Lovecraftian influence.
https://gamebooks.org/Series/108
I have not read Sons of Uruzime, but it is advertised as a Lovecraftian gamebook: http://gamebookadventures.com/gamebooks/sons-of-uruzime/
The Bodies in the Docks is free: http://outspaced.fightingfantasy.net/PDFs/Cthulhu_Gamebook_PDF.PDF
Lost in Innsmouth: https://play.google.com/store/apps/details?id=com.jwa.lost
Transomnia (free): https://play.google.com/store/apps/details?id=com.PrimeGames.Transomnie
Finally, a Kickstarter for a Lovecraftian gamebook is currently raising funds: https://www.kickstarter.com/projects/federico-rebeschini/a-forest-lovecraft-based-choose-your-own-adventure?ref=hero_thanks