There is something, anyway we are still far away. The "u" gives quite good idea of a surprise. Try working more on the font face and to put the focus on the "Z" instead of th "u".
Last, but not least, pay attention to color palette.
I'll give you more details later when I go back to the office and meet my colleague, but I would say is to work on the font itself, to make it more intriguing, try to explore the third dimension or to make the word explode of joy. :)
coming to submissions: #8 is funny, but we are not so keen on characters, while #7 is quite "straight forward" why not try something really different on the "Z" to make it more lively?
I'll try to post some reference when I'm in the office in the morning.
I can not submit the revised logo. Because I'm not in first rank. Please see in the brief :
"Only the 1st ranked designer will be able to submit entries. This contest is currently in judging mode. The contest ended today. The contest holder has 7 days to select a winner The contest holder has received 0 reminder emails to a select a winner."