Hey hey!

1. If you are going for the playful choppiness of the business card shape, maybe take it a little further because it looks like you are a little timid about it in this current iteration.

2. The logo looks a little cramped on the back side, either scale it back or go big and aggressively crop it.

3. The info side feels a little scattered. You can juxtapose the playful nature of the logo with some good organized type.

4. Watch your margins with type and info.

5. The letterhead looks cool but I think the design elements are a little too big which leaves little room to type a letter. If you are gonna die cut the corner it will have to show on the back side version as well.

6. The style guide looks really fun, but again, make sure there is some hierarchy and templated elements. Separate pages if need be and throw in some instructable text paragraphs here and there to explain the rules you are establishing.

7. Remember not to break any rules in all of your branding pieces that are documented in the style guide.