The issues you listed are likely related to the android device you're playing on, at least the graphical issues and the dialogue choices that freeze the game.
Sadly, it's too late to change the engine to something like Ren'py for a point and click room exploration style. However, I can change the way navigation works on android through point and click if you think that's better.
I'm also working alone on this and it's difficult for me to see why on some android devices the graphical issue appears. If you can, feel free to drop me your device.
Also, regarding the patreon only content in itch preview images, it's not really intended to be anything malicious. For a good amount of time, there wasn't much or any growth in support for development and I've been trying any way to make development sustainable. If income wasn't such a trouble, many of the issues you listed above wouldn't be a problem because I'd actually have enough time to take care of most of them and at the same time I wouldn't need to go to any lengths to "entice" players to "patron-only" content.
It may look malicious or "not nice", but well, that content isn't functional in WebGL right now regardless.