Unfortunately, I broke my arm and don't have the ability to draw right now, so it's on pause, but not sure that I've continue it. Probably start new project or something. But, can't say for sure. Maybe I'll finish it at some point.
Heya. I really appreciate that you like my project and trust me, I want to release this update not any less that you want to play it. But, I believe you do understand, that I have a full-time job and a social life, that takes most of the time. I use all available time to finish the game, no worries, it'll be finished some day, maybe after Armageddon. :)
For this game I'm using RPG maker MV, SAI2 and Vegas video. But, you're free to choose by your needs. I believe you can do your masterpiece. :) Violet door do nothing for now, and there are two endings in current version.
That's understandable. English are not my main language either. Right now, second ending just exist. You better wait until small upcoming update, that enhance it. But, if you still will be struggling to find it, I'll make a guide with pictures later. :)