I like the last answer from @twisted1919 as for the colors...my personal opinion even though it's already mentioned on this thread before... they are ok as they are no problem.
Actually -> https://developers.google.com/gmail/markup/reference/one-click-action#confirm_action that doesn't work either *Microdata, not sure if needs to be for feature versions .
Just found another problem (or I need to study more) you can't use something like that in a template:
<script type="application/ld+json">
{
"@context": "schema.org",
"@type": "EventReservation",
"reservationNumber"...
I believe there's a language barrier in the discussion I read over themforest, I feel confident that soon enough (maybe before the end of 2015) we can see this addon live :)