As the others have said, be sure to interact with your subscribers! I have a really good subscriber base as I know a lot of them by name as I let them add my skype, being able to have people come and talk to you keeps them active I've found. It also make them more motivated to help you succeed!
Your videos have a lot of energy! But I see you haven't uploaded for almost a week, you really want to try and remain active with frequent and regular uploads to keep people interested in your channel!
I've subscribed! Youtube just hasn't updated your susbcriber count yet
Good luck on the channel man! Hope to see it grow!
-Adam