this project is similar to 1000+ projects already uploaded on envato - this is the reason. yesterday was same topic. and day before. every one wants to create template using this popular style of animation =) but you forget about envato requirement: “unique projects” =) yes, they accept some of them. but its like a 1 of 10.
your item rejected not because there is some mistakes - they just do not need it in the market.
use unique details in slideshow, creative style… if you will create something new for envato it will not be rejected even you have little mistakes
new - unique - creative