I feel like you have a pretty cool game and can definitely expand upon this.
Perhaps make it so that the timing isn't as strict and have a greater emphasis on the sounds.

A little tricky, but good execution

Fun, relaxing. Could use a tracker for streaks, which is the funnest part. Great audio.

Sounds great when you get 2 or 3 in a row. I just wish it was easier to get those streaks, because sometimes it feels totally random!

An interesting interpretation of the theme.

Glad to hear that you enjoyed the game! I was hoping that changing the difficulty would be sufficient for changing the experience, but the timing is still fairly random, due to the random circle sizes. I might look at expanding on the idea and either find a way to make the randomness work to create an interesting experience, or just set each circle size individually and turn it into more of a rhythm/skill based game.

Hitting the tiniest circle is near to impossible xD anyway it's a nice game. i would have loved to hear more sounds (maybe unlocking some looping pattern). good work pal :D

As some have said, it is a neat concept and a good execution, but you may want to expand it, maybe with other shapes associated with other sounds, possibly by giving it a rhythm and making it not as random. Another option could be increasing the difficulty over time. But anyway cool game and excellent interpretation on the theme.

Nice calming game.

I like it :)

Oddly relaxing and fits the theme nicely.

Cool. I liked when I managed to get two circles without an off-beat. It'd be nice if that were more doable--I love in rhythm games when skill can let you actually play a song.

Really nice.
I like it.

buuuuut... there is something I can't find that lacks from this...
Maybe... some score tracker or a bigger aim?

Still great. :D

nice original idea... needs further development...

It's not technically a game, but more of a toy. Also I think you should start the player out rather easy... make the outline really thick and as he/she progresses make the ring thinner. Add some scoring, otherwise a fairly solid entry.

Spent a bit longer than I thought I should playing this :P

Maybe as a future idea have the beats timed to some background music? So you add to the music while playing.

Thanks for your feedback everyone! While I was developing this game, I found that I rather liked the relaxing feel of the game, although I'll admit that the randomness of the game kind of threw this off a bit. I didn't want to add stuff tracking progress like scores or streak counters, as I felt that that might throw off the relaxing nature of the game. As it stands it was a bit more of a toy, but a fun one nonetheless. I could definitely turn this into a more polished and focused rhythm game in the future regardless :)

really reminded me I need a new mouse... :) It's a really neat concept... could be expanded out in a lot of different ways.