Happy to hear you've enjoyed (and dreaded?) it!!! Doomed yuri my beloved...
Unfortunately, I never thought to make an endings guide for the game, since I felt they weren't complicated to achieve. Looking back on it, I definitely should've made one for the sake of player convenience.
I've fixed this by editing an old devlog to include a walkthrough for each ending if you're still looking for it! Thank you so much for playing :'D