Have you played wordle? Did you share your results? In my case, I shared my results in Wordle when I had particularly rewarding solves: perhaps I puzzled over a particular combination of greens and yellows for 5 minutes or so before finally, triumphantly going AHA!, and typing in the answer instantly. (It's also amplified by it being very do-or-die sometimes - you very obviously only have 6 guesses, so if you don't get it right, you very well might lose.) This moment is exhilarating. It's a large piece of why people share Wordle results: they're still coasting on that feeling. These moments are hallmarks of good games (or, at least, sharable ones).
Another, less important reason people shared Wordle results is because they had a moment that they thought other people could relate to. A classic is having 4 letters right, but being stuck on the last letter for multiple guesses. I'd share that out, because my friends would get it (even though they wouldn't know my exact sequence of guesses).
With your game, I don't see any of these two cases. While it's fun to click the colors in fast flood, I don't have any exhilarating AHA! moment. Perhaps I could sit down for 5 minutes and puzzle out which sequence of colors I could press, but it feels neither do-or-die nor particularly rewarding to do so. It's more of a rational "oh, I see, if I click red-blue, I expand to this area faster", etc.
Second of all, there's nothing worth sharing, in the same way that it's sometimes rewarding to share the second case I wrote about Wordle - there's nothing other people could resonate with or be interested about. In fast flood, I just share my times and color counts. There's no story or interest there, not in the same way as the second case that I illustrated in Wordle.