Great use of hand tracking, although did suffer a little from SMOHS - 'smacking my own head syndrome'... so perhaps the mouth trigger could be made bigger?
It was enjoyable and fun, but felt like it needed a little more to it to make it more exciting. Perhaps, like having things to avoid, having more than one sphere and picking the one with the most points - just to vary the gameplay a bit.
I did find the apk at 404Mb quite excessive for what it is - I think you might have some huge assets in there which could be compressed or reduced in size.
Overall, great effort and fun little game.