my time has come
First, ditto to Vxmpire's mentions, all fit a 'cute horror' vibe very well, although I'll admit to not being much a fan of Mogeko, simply as, whilst it's meant to be a "violent gag" comedy, (バイオレンスなギャグ), game, I dislike the content that is joked about being treated as such. The art is very cute, though, and some of the CG's are gorgeous.
Some others I'd like to bring in are as follows:
Therapy with Dr. Albert Kruger - EN / JP / RU / KR / CN / etc.
Robot Daycare - EN
Pumpkin Eater (probably not the kind of cute you're looking for) - EN
Turtle Head Unmasked - EN
CORPSE FACTORY - EN
Shizuku no Oto / Sound of drop - EN / JP
Don't Toy With Me - EN
The Elevator Game with Catgirls - EN
Decompose with Me - EN
Creepy Creepy Love - EN ( I love the poorly translated PC-98 game vibe of this one)
HOPE LEFT ME - EN / JP / PT / RU
Dawn of the Damned - EN
Chaos;child & Chaos;head - EN / JP / CN / PT / RU (read chaos;head first, trust me)
probably so many more, but most others i know either have NSFW content, aren't in English, or likely aren't what you're seeking as far as "cute".