Have more clarity on how a player is judged for passing or failing level (win condition)

Right now the win condition of each level is somewhat unclear. There is an objective but I can actually be pretty sloppy and win easily, building almost anything in many cases. I understand the first levels are meant to be easy tutorials but it would be good to have a better understanding of what forces on my dummy result in a pass or fail. I like being challenged and I feel like right now, in the head-ons for example, I can be flying through mid-air and still pass the level (because I didn't touch the ground yet I guess?).

So how long do I need to not touch the ground after the opponent does? There should be some countdown or something making it clear to the user what exactly they need to do because without it it feels somewhat random whether I win or lose, and not particularly challenging enough.