Not much to say here, another reaction game. More minimalistic than most, though I'll give you credit for making it quite visually pleasing, the colour scheme was actually for some reason really nice to look at and the overall design was very smooth. The music was also very catchy, for a couple of minutes, but the loop began getting annoying after a little while, especially since it doesn't actually loop very well, there was a slight pause afterwards. It was programmed well, it worked, but I'm not going to go into much detail because there isn't really too much programming involved in a game like this, but since it's your first submission to NG (I'm not sure if you've made other games before anywhere else, I'm just going by what I can tell) I'll give you newcomer credit.
I didn't play for that long, I'm not a jockey for high scores or for medals or anything like that, I think I did 3 play throughs but didn't get very far. I think a couple of draw backs are that you don't have any specific obligation to react, like a time limit or anything. On top of that there is very little in replayability, I didn't notice (I could be wrong) any difficulty curve and to be honest it started out pretty hard to begin with. There was very little time to react and when you did you only got one chance anyway, one wrong move and you lose.
Usually with games like this you start of with maybe 5 seconds to react then everytime you react successfully the time you have to react decreases, gradually getting harder until ultimately you can't keep up. On top of that you could get upgrades like extra chances, temporarily slowing down the speed giving you more room to react and so on and so fourth.
It makes me nostalgic of your classic reaction games, back when they bothered to give them a theme. I used to love the "Bullet" reaction games where you would have to dodge a bullet shot at you and the gunman stepped closer each time. You could have given it more of a theme than just react to the dots. But then, it's alright I suppose.
Points for effort and for actually making it look quite nice and I hope you continue to create things, bigger and better in future.