This isn't intended to be a complete review, but just my experience out of the box. I'm testing on an Android zfold 4.
For me, so far, the upvote buttons are difficult to activate and the comment window that appears on top of the video allows me to touch through it, restarting the video, if it isn't still playing. Nothing major, but both are small nuisances, that kind of put me into annoying little loops of whack-a-mole.