I mean this in the best way; I'm hoping this helps to hone your performance further, and polishes it to a shine.
Oliver Addams has offered a wealth of advice; pay heed.
About this performance specifically;
0:32 - you kind of walked on the laugh the spectator gave you with the reaction to the 'cheap seats' line. Maybe let it breathe a bit, or call the action? These kind of things are great for revealing character.
1:03 - ask the volunteer to come up first. It may make for less dead time if she's on her way to the stage before the applause.
1:15 - 1:34 - you really need something for this spot. It's half a minute of a guy standing around. Maybe a brief teaser about what you're about to do? Some smart line? Or maybe this is where you ask the volunteer's name and the applause line?
1:36 - 1:41 - you really should take her hand as she's getting on stage, shake her hand and be a little warmer.
1:45 - block it so that you're both kind of facing the audience more, rather than each other; (see Ken Weber's Maximum Entertainment) - you both want to be kind of 45 degrees to the edge of the stage, facing the audience more than each other.
2:20 - you may want to rephrase it to something that is more positive, more of a statement; "That would be amazing, would it not?" - something that says it's amazing, like that. "Would that be a good trick" is somewhat minimizing; at best it's a good trick, not a miracle, not an amazing trick, not something incredible. It's also too easy for a smart alec to say "no".
3:04 - let the applause begin to die down before you reveal the kicker; don't try to stop it at or before its peak. Also, consider making the kicker seem like more of an addition; when you begin with "no, no, no" it seems like something contradictory is about to follow, rather than confirmatory. Maybe let the applause go, and say something along the lines of "but that's not all...this was meant for you" etc and then go into the reveal.
3:20 - May as well let her keep the card - why appear grabby?
3:30 - shake her hand and thank her before the round of applause.