Thanks for playing and meaningful feedback. It is very valuable to have an outside perspective. "stack 3 boxes but when I stack 2 nothing happens" - I will take note of this problem.
What confuses me is that 4 out of 4 players could not understand how to play, because when we learned to play simple games like Minesweeper or something, we did not read any instructions and there were no special tips, we just tried to play and that’s it it worked. Maybe other players, those who managed to figure it out, simply didn’t write anything. Or maybe, having encountered a problem, they immediately left the game. What will happen if you make a slightly more complex game or even a very complex one such as a strategy, RPG, game universe, or new game mechanics...
In any case, I have already started working on and adding simple visual indicators to this game