This specific jam welcomes projects that have been in development for a while (and hey, at least 2/3 of the current submissions are in the same boat, haha) , so I'd definitely consider it fair game.
Okay, here are the bugs I spotted:
Re-entering the mayor’s house after obtaining the hat shows the hat on the mayor’s shelf again, and re-selecting the dialog option to get the hat results in a softlock, with the cutscene failing to play out, and the player being trapped in the cutscene room. (Edit: Already reported by Kithran)
After collecting the whole crown (not sure if this is what actually causes it, this is just when I noticed it) there is a crash when selecting available/completed/all quests in the journal:
SyntaxError: Unexpected token u in JSON at position 0 at JSON.parse () at Window_QuestData.getQuestObjectives (YEP_QuestJournal.js:4073:29) at Window_QuestData.drawQuestData (YEP_QuestJournal.js:4025:25) at Window_QuestData.refresh (YEP_QuestJournal.js:3988:10) at Window_QuestData.setQuestId (YEP_QuestJournal.js:3977:10) at Window_QuestData.update (YEP_QuestJournal.js:4752:24) at chrome-extension://odlameecjipmbmbejkplpemijjgpljce/www/js/rpg_core.js:7035:19 at Array.forEach () at WindowLayer.update (rpg_core.js:7033:19) at WindowLayer.update (SRD_HUDMaker.js:276:23)
When entering the second clearing in the forest from the north (either entrance, as long as I'm moving down), I occasionally had the screen go completely black. Moving around until I re-entered the previous screen fixed this every time, but it was still weird.
It's possible to get softlocked until the day timer runs out in the light beam puzzle rooms by moving a block into the exit. I don't have any early enough saves to check, but I imagine this is also possible in the room with 4 statues, but you'd kinda need to be trying to do that, haha.
I also had the game lock up visually (no more graphics updates, but I can hear that the game is still running despite that) a few times, but I'm not sure what caused that. It seemed to be random, and I couldn't reproduce it any time that it happened.
Edit: Oh, one more thing. Ziba's hint for the location of the item in the town (which I personally saw by opening the game up in Translator++) doesn't appear to actually trigger in game after investigating the flowers, unless I'm missing something. Making this trigger correctly would definitely address my criticism of the lack of hints for that section.The cell door puzzle might be better with additional hints though, if I hadn't personally made a TF game with a puzzle featuring notches and modulo, I don't know if the answer would have been as clear, haha.