Great job with this game. It was super easy to learn obviously, but difficult enough to make me want to get the upgrades. I was going to mention that the roots were too hard to see until I realized that was an upgrade, haha. The first couple times I didn't even know what was hitting me, so that made a huge difference.
My only feedback would be to scale up the points with the difficulty maybe. The game gets harder but the reward for surviving doesn't really feel worth it. Maybe there could be other color candies worth more points the further you go down or something.