a few things i forgot to mention, the chase scene in counterfeit island goes way too fast, it's doable but a little jarring, and in steamworks it's not an npc its just a puzzle
wild west island cannot be completed, you cannot close the horse minigame (regardless of win or lose) which means you cant leave the starting room on the island
cryptids island cannot be completed. DO NOT jump with the kite, you will go up and not come down, same as the balloon in counterfeit island. if you go to the left of the starting room, you will suddenly become attached to a hot air balloon (i think its a cutscene that isnt properly playing out, bc its not my character the screen is focused on)??? and you cant move at all. thankfully, you Are able to teleport out, so i don't need to make a fourth new profile (yet....)
wimpy wonderland cannot be completed. the sequence of driving the teens away from the store after changing the radio will just load endlessly, so you can't get the item from the store. clicking on the tv in greg's house also loads forever.
gameshow island cannot be completed. trying to use the heat vision goggles will only show a corner of the screen, and the effect can't be closed
magic treehouse red dragon island cannot be completed. most minigames can be completed up until the sumo match (however, you have to click the X to exit the minigame afterwards, as it doesn't close on its own) but the stage for the sumo match is completely invisible, and during the match, the sumo only stomps once, never moves again, and can't be pushed. leaving the stage (a loss) will simply load endlessly. you have to save and quit to escape, thankfully you are not trapped forever
mystery train island cannot be completed- the island works fine until you get to tesla's sketch, which stops working once you click with the pencil. also the bathroom on the train is very laggy?
sos island, maybe but probably not? after saving the first person you have to go to the ballroom, but that room is so laggy i just quit the island and went somewhere else
scary story island probably not, the hedge maze is hard to navigate due to the off center problems, and exiting from the other maze exit leads you to a room that is going crazy with visual bugs and lag
vampires curse cannot be completed. the room past the moat is incredibly laggy and the rocks you are supposed to push barely work and will get stuck on just about anything, so you can't finish the puzzle to open the door