I like the way it turned out as well. I've put our names in the credits by the way (alphabetically). I hope that's alright with you?
Did you receive the e-mail I send you? I asked you the same question about sending me your front design, haha. But either way is fine by me. I think it would be better though if the PURE EXTENDED CONTENT matches the font on the spine and back, don't you? I could send you the font if you want?
About the empty space on the top. I've tried several things, but none seemed to look nice. Perhaps a tagline would be better. Like 'To train ze dolphin... you must zink like ze dolphin.'
I think the full card looks too busy. I've tried that already. I'll just place the tagline there and post a new preview.