Koalala, fairly nice squats. I'm fairly surprised that they're wasn't any knee slide forward at the bottom, since it seems like just about every video that gets posted here has a case of this.
The only problem I see is a failure to set the lower back in hard extension before the descent, then some substantial flexion occuring as you near the bottom then start back up.
Set your low back hard then keep that arch for the duration of the rep. There are a number of cues to address this in SS, so I'm not going to insult your intelligence by rattling them off here, unless you've tried them and none of them seem to work for you.
And no, you're depth is fine.
-Stacey