From a UX perspective, I might consider dropping the amount of items per frame. It's a bit easy to be trigger happy, so users could end up tapping spacebar before all the items had a chance at drawing their attention. The success metric here is probably to draw users deep into the funnel as opposed to exposing them to as much as possible. Increase the "sense" that it's signal rather noise.

I like the icons depicting the categories/types btw!