PLEASE NOTE: This review is written for the 2021 Minetest Game Jam version of this game, by a PARTICIPANT. I used Minetest version 5.4.1 to playtest.
The problem with this game is that the very game concept is not convincing. You just click squares and HOPE it randomly turns gray or green. And it seems there's only one level. I can't see how this could be possibly fun for more than 10 seconds. To me, it feels very boring. This is very subjective, I just write about my feelings here.
But it is probably a good thing this game itea is so utterly boring, because then casinos might sure as hell might find a way to capitalize on it. ;-)
Even slot machines are more "engaging" than this. I am biased, of course, since I DESPISE casinos and gambling mechanics and this looks like a classic casino game, except it probably won't get adopted.