One of the more frustrating elements that makes the players want to grind their teeth is the occasional ridiculous cascade, making the game more prone to luck-based than tactical-based.
Anyone played Tetrix before? It has a feature where it informs the player of the next incoming block.
Could we have similar feature in this game?
An indication bar that shows perhaps the next 3 gems, dropping from left-to-right order.
You could even incorporate this into Game Difficulty. IE: Regular mode = 3 gems preview, Hard mode = 2 gems… etc.
I believe this would certainly add Tactical element into this game.
IE: Some players might not enjoy this type of additional distraction, so maybe the feature can be a toggle-able option.