I found So Many Me Extended Edition to be extremely frustrating. It requires laser precision and a psychic amount of forward thinking that makes its skill floor very high. However, if you enjoy throwing yourself at puzzles over and over, bending a game's mechanics until they succumb to your will, and collecting everything you possibly can, you'll find a lot to love in this small, adorable package.
Mandate of Heaven is an interesting DLC that adds the events leading up to and including the Yellow Turban Rebellion. Incite the rebellion or attempt to crush it, it's your choice. Be prepared for challenging situations that may frustrate you and make you want to stop. Longtime fans of the series and genre may appreciate the challenge more.
Orangeblood is a mixed bag. On one hand, it's visually striking and has a conceptually deep battle system. On the other hand, the english translation is incomprehensible and your characters are too powerful to really have any sort of challenge or interesting fights. It won't physically and emotionally destroy you like the Lisa games, but it's still a decent enough RPG that I can recommend if it's on sale.
Lost Ember ties a fun, original gameplay concept to an enjoyable, if a bit unremarkable, story. It will feel too thin for anyone approaching it looking for any amount of challenge, but if you're willing to just enjoy the journey and let the story wash over you, Lost Ember is a singularly enchanting experience.
Lethis: Path of Progress shows some real potential and brims with character but ends up feeling like a struggle against the fiddly controls and the path mechanics seemingly just doing their own thing despite your best efforts ultimately leading to frustration.
With an endearing, violent, and engaging story, AI: The Somnium Files is an adventure game that fans of the visual novel genre should not miss. With a novel puzzle-solving mechanic and impressive voice performances, this game is a dream come true.