I've been in touch with Forsaken Waffle and he said they look like they're unusual bugs. If it counts for anything, I used Firefox to play the web version in my video. I don't know why that would matter since you're using RPG Maker though...
Viewing post in Memoriam jam comments
There's probably a few bugs left in the game that I didn't find to squash before the polish window closed. The game wound up pretty big for a jam title, with rather a lot of moving parts compared to my previous projects. That combined with the short timeframe for testing meant I'm not surprised there are still a few ways left that you might be able to softlock in certain circumstances I've not been able to stamp out yet, so apologies for that one!