I obviously could be wrong about this, but I wonder if one puzzle per day is too few to get people hooked on the game? I know it worked for Wordle, but that a) had novelty on its side, and b) was lucky. Right now I'd happily play a bunch more times -- and perhaps find it fun enough to make a point of coming back -- but having played just once, I think it's 50/50 whether I'll remember it tomorrow, and if I don't then I may never think of it again.