It's pretty good,  I like the idea of a meditation cycle though something more could have probably been done with that, since the gameplay is a bit simplistic. The ringing can get a bit annoying though, should probably change it for some softer sound effect that isn't as obnoxious.

Great work with graphics. Next time try to add simple music for make game to make it even better, for example you can use easy web program for create simple loop like this: BeepBox Link (less than 3min for create that)

Really nice idea! I like the art style and the meditation style bell is a nice touch. My only suggestion is you could make the aura disappear in thirds so it's really clear that the meditation is lost after 3 "fails". At the moment you have a large aura, a slightly smaller aura then no aura.