Hey thank you for the kind words and for playing the game.
We are aware of the random RNG for the games. We intend to fix it after the rating period ends and we can update the game ofc.
The gum upgrade guarantees that at least one of the coins will be what you bet on and 2 others are random.
Till then I'd suggest going faster on the rounds betting all your coins, you will get the win after a few rounds for sure!
Cheers and thanks again for playing :)