I like the idea, but I'm either too stupid to solve the first problem where you make your own tags or it just doesn't work? My answer was (from top->bottom) 8,9,10,11,12,13,14,15,16. They were integer type (I used the left most box, which looks like ints to me). I did try some other solutions before that obviously didn't fit the criteria, so maybe there was some junk nodes left behind from that?
Anyway, I feel the first rounds with predefined labels were more fun! I had to figure out what to do with the labels I had. Ofc that makes it a lot easier, but I feel giving complete freedom to make your own labels might be too much. Like with predefined labels those are clues I'm doing something wrong and there aren't like infinite possibilities to do it wrong. With my own labels I have no clues and it's very hard to then understand if I'm wrong or if the game is not working as intended. Maybe instead of complete freedom to make labels, have like 1 or 2 labels the player can change, together with a bunch of predefined ones. Or have labels with special effects, like maybe some can be wildcards or count as 2 different numbers, etc?