Thank you so much for your kind words! This was a big passion project of mine and it was my dream bringing it to life. I hope you'll download the game when it comes out on Steam eventually!
Technically, by reaching the end of a route and not seeing the Day [number above 40], you've gotten an ending.
There's three types of endings in APDS - the non-character endings, of which there's 4, the good character endings, of which there's 7, and the true character endings, which there's 7 of as well. If you've reached the epilogue with each character you've successfully gotten both the good and true ending at the same time, which is tough on a first playthrough, so congrats!
Your first playthrough on Gregory's route might have ended early because you missed something that would've given you points - the true ending is only accessible if you've done everything perfect, but all endings have been in the game since the start.
Thank you again for playing!