I thought this was cool! I love all of the drawings you added, I bet that took a lot of extra time so it's really admirable. At first it was a bit confusing to have to many characters talking but I think I got used to it by the 2nd and 3rd playthroughs. There are a couple minor spelling/capitalization issues, nothing crazy but it could be good to run the text through Grammarly or have someone revise it!
I played through all 3 routes and got the same ending each time, so I'm assuming there's 1 ending (unless I missed something)