https://www.youtube.com/watch?v=u2RtvETiqto
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Nice Job! My amateur eyes can't find anything wrong. Perhaps someone better than me can find something I missed...
....maybe just a slight amount of back flexion on the last couple of reps. But hard to tell.
And maybe you are just barely shy of lockout. barely!
Its like you lock it out for nano second, then unlock your knees as you lean back a little too much to over emphasize the completion of the lift.
Just stand up at the end.
Overall pretty good IMO.
You could stand on a third rubber tile to get the correct start height of the bar.