I suggest adding a system of guaranteed high-tier merges that scale with player level. The higher the level, the better the guaranteed merge results. For example: Levels 1–10: 3 items = 1 guaranteed merge Levels 11–20: 5 items = 2 guaranteed merges Levels 21–30: 7 items = 3 guaranteed merges Levels 31–40: 9 items = 4 guaranteed merges and so on. This would reward progression and make leveling up feel more impactful.