Couple points of criticism:
1. The one of the right (if you're watching the video) started way before the other.
2. Talk more energetically. If you look/sound bored, than the audience will be bored.
3. Try not to ruin the effect by throwing the cube like that.
4. Don't have a 30 second clip telling people to subscribe to you... don't even mention it. Also try not to have anything longer than 10ish seconds that isn't content (ie an intro).