That is a really great idea that was considered, but couldn't make it into the game. Adding more items progressively would be the best way in my opinion as well to scale up the difficulty, so I hope I'll manage to get it into the game in some way.
Also sorry for making you play the first round a lot, I was the one who drew the room and playtested most of the time so I was pretty used to the game and just powered through it, forgetting the fact that other people may not be able to memorize 20 different items all at once... Thanks for the feedback and the compliments!