So good! I tried to come up with a word game myself starting with the letters "NOTHING" on the board, but didn't even consider randomly generating the words as you draw lines, genius!
The game was incredibly hard until I discovered the reroll rule, which made it stil hard but at least bearable.
At first I thought the game would only give me "everything" if there were no other viable words that fit, but that turned out to not be the case.
I came up with a way to solve it using reroll that was still tricky, but at least got it done pretty quick after that.
Proof: https://i.imgur.com/noIBFO5.png Here was my way to approach the solution (spoilers): I would spell a long word, and then with any E/V/R I would reroll 3 letter words around them until I got EVE or EVER, then turn that into EVERY and extend that to a 10 letter word and hope to get "EVERYTHING". I got "EVERYPLACE" and "EVERYWHERE" a bunch of times first. The same thing would be possible working backwards from "THING" but it's harder (you also end up with words like UNCLOTHING).
Oh and here's what my board looked like right before I beat it (again, spoilers): https://i.imgur.com/PeizHMv.png
One bit of feedback is that it would be nice if the reroll went through all the possible letters in order instead of truly random like it is now. Sometimes you have to click a lot to get to a letter you know is valid.
Anyway, that's about it. Just wanted to say I thought this game was great and it's a really unique experience.