Recently played Azusa 999. It's an rpgmaker game from 1997 and in a lot of ways a precursor to Yume Nikki. It's interesting to check out. I would say it's closer to games like Ib than Yume Nikki, but a lot of the themes and ideas are similar (another world that is sparse and unpopulated, non-human creatures, trauma around violence/bullying/suicide/depression/isolation, etc)
English translation download:
https://obskyr.io/azusa999/