This is really good! I played through most of the endings and both the artwork and the UI are great, though I have a few suggestions.
1. There should be a page where you can see which endings you've unlocked.
2. Scrolling through the messages seems a bit janky. I don't know how hard it is to code that, but if it's not too much of a hassle, it'd be great thing to improve. If it's too much work, then it's not really that big of a problem.
That is all, thank you and I hope you have a great day =D