I've played this game before. I see you have added many new symbols, synergies, items and a few new animations.
I think the game is fun enough for a couple runs every once in a while, but I'm not sure how you could develop it further. The loop to win consists in picking the same kinds of symbols and items over an over. I like that there's a way to delete symbols too, but besides that there isn't much more strategy to the game, assuming you would even want that in the first place.