Very charming style.
The game starts very slowly even at high speeds. Honestly I think it would benefit from some "prewarming" where the board starts with a lot going on already.
The stamina bar is a bit pointless. And it's so short that running might as well not be an option. The board is lot large enough for running to be particularly useful in the first place. Everything bounces around, so there is no reason to rush away from the center of the screen.
The way the chains work tripped me up for a bit. In this sort of chaining system I usually expect that, once I get 3 of a kind, I can go for another kind without breaking the chain. I don't quite understand why it doesn't work that way. As-is, the game quickly becomes about waiting and hoping for good RNG, and even then, you are forced to break your chain eventually. I might be wrong but it seems that since scoring is exponential, the optimal strategy is to NOT chain, but avoid collecting a single color until the screen is full of it. Then collect all of it in one go to start the game proper with a 10+ chain to get your best shot at a super long one. That's quite a toxic waiting period to have in a game.