Ok, I'm not going to break this down by time stamps as Steer already got that.
First, like the others, I want to say congratulations for getting up there and doing it. Good job just for that.
Now, I know that takes some balls to do this, but sweatpants? You're performing, look like a performer. That outfit makes you look like a kid that just wandered off the street. Plus, it doesn't enhance your performance at all and that's a problem. I know a three-piece suit is probably beyond your budget (I say that because you look pretty young), but something that helps people see your hands and the cards would be a better choice. There were a few points where I lost what you were doing because there wasn't enough contrast between your cards and your shirt. If you're not fashion-savvy, have someone you know who's good at dressing tell you what to wear. That's what I do.
Andrei already touched on the confidence thing. You look scared. I understand. You're in front of an audience with nothing but yourself and a skill. That's intimidating. Stand up straight, speak from the diaphragm, look at people and at least pretend to make eye contact. Here's another thing I do when I'm feeling the jitters - Say there's two lines of seats. I look in between the seats as if I'm directly looking at a person. Everyone in the first row will think you're looking at someone in the second row, everyone in the second row will think you're looking at someone in the first row. I even make comments to and respond to comments from that imaginary row sometimes.
Be aware of, and interact with, your audience. You got some moments where people reacted but you didn't acknowledge it so you couldn't play on it. Take a mental note (and then write it down after the performance) of points where people react, and work with those in the future. If you do something and half the crowd goes, "oh!" then that's a good bit of flourishing. Next time, maybe you try to put a slight pause in there so you can look up at people and build a little tension before the payoff of the move. You spent most of the performance looking pretty much at your hands. This is a very insular performance. You want to open up to draw people in.
Choreography. You just kind of started, did stuff, then faded out. You don't have to have every single second choreographed (though I advise that). Take a 4-minute song (Since this was a four minute set) and put it on repeat. Listen to it several times so you can identify distinct parts of the song. Maybe there's a part with a good snare drum, or a guitar riff, or a cymbal crash, whatever. Identify some of those, and use those as landmarks. Maybe in between them you free style, but at those points you'll be doing specific moves. This also helps you have a distinct finish so you can take the bow and hopefully accept your applause. This also helps you pace your performance so you don't dump everything you can think of into the first minute then spend the next three minutes going, "oh crap what I do? I can do ... this!" over and over again.
I don't know if this happens to you or anyone else, but when I do skill-based performances I have the issue of forgetting everything I know as soon as I get in front of an audience. So if I'm doing a free-style poi-spinning set, I'll be ready to go with twenty tricks .. then step in front of the audience and suddenly I can only remember the basic 5 or so. By having a set structure to a song you're familiar with, you'll begin to do those bits subconsciously so you don't have to worry about forgetting things.
And one last thing. Concentration face. This is the expression we make when we're doing something that's basically at the limits of our skill level. Try to avoid that for most of your performance because it makes it look like you aren't confident in what you're doing. When practicing, try to replace your concentration face with a smile, so that when you're pushing yourself you'll start to smile by default.