Rain World! It has "endings" but the fact that it's sort of got a strange nature simulator / documentary vibe can kind of make it like a very difficult terrarium (that you're also living in) at times. The endings are also very much not required and can be totally ignored lmao.

I love exploring and befriending critters and just the movement system is like nothing else. Creatures living their lives totally independent from me is such a cool aspect I haven't seen done anywhere else quite on the same level. Just the emotions system of the scavs alone is so interesting to learn about! I love how it looks! I love how it taught me that failure doesn't matter and enjoying the journey can be beautiful. I love how you are at your most powerful when you are "most weak" (losing all of your, we'll call it "health" means death is completely consequence-free, and you can just experiment and scout freely and it's so fun to me.) You sort of make your own stories as you go along and I think it's neat.

Also I love bugs and insects. It's got a lot of 'em.