This is a really nice, relaxing game, with a cool take on the theme. I really love the fact that the triangles turn as you rotate! Personally, expert mode is the definitive way to play, as normal mode seemed a bit easy. If you consider developing this in the future (and I recommend you do, as it would work very well as a mobile game) I'd suggest making the difficulty ramp up as you play. 

Very solid game, great job!

Your game is very elegant. It is clean and eye-catching!

Super minimalistic in a good way! can see this being developed to a way more rich game in the future

Really cool game ! Huge potentiel, I hope you'll turn it into a game with levels / enemy or more mechanics ! The atmosphere is really cool :D

This turned out great, but I think there's something even cooler hiding in this mechanic that you made.

Gut feeling is that it wants predesigned levels or SOME predesigned sequences (either small or long) that can allow players to anticipate (rather than just react) to the game. I think it'll give the player a sense of mastering the game (eg. DDR or Beat Saber) - but that's just a gut feeling!

Very minimalist, but very sleek looking.

I found the background spheres a bit distracting, I wasn't sure if I had to do something with them at first! Love the effect of the tail behind the spheres that changes according to the speed.

Simple, but well made!! Really like the minimalism!

Loved the concept. 
Great presentation, great gameplay. That's a wonderful example of how a simple concept can make a good game. 
Congrats

Great presentation overall!

Very nice look and feel! Minimalist graphics, when done well, can end up making the experience that much better! Controlling the circles felt fluid and nice

I like it . Basic and fun

I like it . Basic and fun

Simple, yet tasteful art style and very straightforward mechanics. Hit mobile game vibes!  

I liked this game. It has great art style and the game is pretty good itself. I'm wondering if there is a way to reach the ones out of range?