First off, nice work. Respect for putting your vid up for feedback.
One thing I noticed you could focus a bit more on is driving your punches forward. To improve this the place to begin is with your footwork (what are you wearing on your feet, btw?). You want a powerful drive off that back foot, transferring a lot of energy smoothly up through your legs and into your hips. Bend your knees and hips also, you're standing tall much of the time while punching.
You also want to throw your fist forward via torquing your torso and firing from there like your fist is the bullet ejecting out of it. More twisting of the midsection and use of the torso muscle groups to fire out your hands, will increase your power and will also keep your arms fresh longer.
Anyway, props for getting it in. Keep it up sherbro.