As a horror game fan myself (and someone who gravitates to the same kinds of games--I love indie horror) I really loved this! The interface really grabbed me, the music and general vibe are set up in a way that evoke the experience of playing a homemade rpgmaker horror game. You put a lot of love into the way this was set up.
As far as the actual poetry, I felt the same way about it; they really feel like poems you could find in these games, and take that same awesome, sort of campy tone that goes big on emotion and horror, if that makes sense. It's the EXACT thing that I love about these kinds of games, and you nailed it. Your poems are like these fun creepy lullabies.
The only games I'm familiar with out of these are FNAF 5 and DDLC, so I'm probably missing something with the other ones, but I think I got a pretty good sense of them. I especially liked the Fran Bow poem-- "This world is filled with monsters, /Who love to feed on darkness. /But keep this in mind / That between evils of all kind / I choose happiness." is a great stanza and makes her sound like an interesting character. The Circus Baby one is really sad.
Like I said, you REALLY nailed that creepy lullaby/nursery rhyme vibe, and it fits this particular project really well. But I hope when you keep writing, you get a chance to try and experiment more with other kinds of poetry--blank verse, free verse, or even more complicated poems like villanelles or sonnets.
Also I feel like I have to drop some game recommendations! I think you'd really like Witch's House, Ib, and possibly Yume Nikki.