What works today
Scene based authoring with simple branching and light state
Choice timers in the 1.0 to 2.0 second range with auto advance
Preloading to cut stalls on mobile
Optional ecommerce embed so a CTA can be shoppable
Defaults I use
First choice at 5 to 7 seconds
Total length 20 to 60 seconds
One or two variables to gate a payoff
Prebuffer the next two scenes
Feedback welcome on better defaults, rough edges on low bandwidth, and what export or embed options you expect before this is useful.