Touhou life sim fangame where you're a human whose goal is to become a youkai without Reimu splitting your head in half.
Like ... you start out living in the safety of the Human Village, and you spend the first phase of the game learning magic and danmaku and survival skills so that you can live alone outside of the Village without dying; however, the longer you stay in the village, the more you have A Reputation As A Human, and consequently, the longer it takes to shuck said reputation -- and if you try to make yourself youkai-like while still living in the Village, that's another potential reason why you might get Fortune Teller'd. maybe you're an Outsider who came to Gensokyo specifically to youkai yourself, meaning you start out without any kind of reputation, but also your basic "wilderness survival" level is lower.
upon transforming, your build automatically changes based on what kind of youkai you've become, you get to rejigger your build a bit in other some minor ways, and your personality changes in ways you don't 100% have control over. you then have like a year to start an Incident, which plays out based on how your build and plot have ended up. the Incident itself probably won't result in a Reimu Bad End no matter what it is, in and of itself; even "destroy Gensokyo" can be handled by one of the usual player characters as long as you stop after you're beaten, whereas if you do some weird shenanigans which can't be stopped by throwing Reimu at the problem, they Sages will deal with it some other way by like Yukari manipulating some boundary to turn your own Incident against you, or one of them tossing a strategically-aimed Flandre in your direction. hey, maybe you could play as an Incident-resolver and defeat yourself!
as a youkai, the life sim is very different, but you're pretty much out of the woods as long as you cause Problems now and then. scare and/or eat humans, kind of thing. or just harass Reimu and contribute to the Shrine's bad reputation.
some possible bad ends which aren't caused by Reimu:
- got eaten in your home in the Forest of Magic or wherever, because you quit living in the Village before your defending-against-youkai skills were up to snuff
- starved to death because you burned your bridges in the Human Village before your regular wilderness survival skills were up to snuff
- starved to death after becoming a youkai because you became something other than a Magician and you weren't scaring/eating humans enough
- started dating a youkai while still a human and you slept over at their place long enough that they decided to eat you, or whatever other character-specific bad ends (i.e. Alice bodyhorrors you into a doll). the game still treats this as a successful romantic route.
- pranked to death by fairies while still human (it's always obvious when this is about to happen, you can pretty much only get this one if you actively go out of your way to let it happen)
- killed/ate any major characters other than a Hourai immortal, resulting in retaliation.
- (Planescape Torment narrator) "You've tested your immortality against the wrong being!"
- killed/ate Merry and created a time paradox