I'm not sure how easy this would be with the program you used to make the game, but this game could really benefit from having a save file so you make a list of all the endings you've gotten in the past. The game just has so many endings it's really hard to keep track of which ones I've unlocked and which ones I want to try to explore next.
I'm suggesting to add a save file solely to have a tab where all the previous unlocked endings are. Even just a little icon of the ending with the letter ending next to it would be super helpful (you could just use grey question marks or something for the ones that players still need to find). You can also maybe add a description of how you generally get to the ending if the player clicks on one they already unlocked? I'm not sure if that would take away from the experience though.