Just did another play through (yes, the game is that fun that I came back to try it again) and I think my major critique is that rare and legendary is actually a trap at the moment. If you purchase those, it dilutes your pool, and makes your early investment into common pointless since its now much harder to get three of a kind. Not sure of a good way to balance this.
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Man, I'm genuinely happy that you came back to play the game and took the time to share this feedback! One idea I had to address this is to make the game "cheat in your favor". Instead of making the chance of getting three matching symbols completely random, there would be, let's say, a 5–10% chance of triggering a Jackpot even when you have several different symbols in your pool. I'd also make Common and Uncommon item upgrades significantly more powerful, so that even if you have a lower chance of getting them, they're still worth investing in