Some things I noticed.
You have a incredibly short stride, maybe around 50% of height (average MLB pitcher is at 87%) although it will be longer on a mound it still looks pretty short.
You land on your toes, ideally a pitcher should land on the ball of their foot, this allows for the hips to open completely.
From this angle it looks like you have an open stride. This can be caused by your hips open early or you hips opening early caused the open stride, either way is counter productive.
Also it looks like you lack intent (one thing I hate about slow motion it makes it hard to judge intent)
Anyone feel free to add or correct.