Seconding Oxenfree. It’s one of the few multi-choice/multi-ending games where I was completely content with the ending I got, and didn’t feel like the game ever lied to me or ripped me off for choosing the “wrong” thing. I had stayed away from it for so long because I wasn’t ready to deal with choice anxiety that I get in a lot of games of that type, but for whatever reason, the game never made me feel like that.
You’ll also be able to get those side quests done much faster after you get your horse.