The question of verification by screenshot was brought up in a run submission. I'd like to pose the question to those who are interested to inform my position.
I believe video proof should be required for all of this game's current categories, except perhaps Speedrun Mode since the run's final time is provided on an after credits splash screen. This would make it easier to fake a run in Speedrun Mode, so I think there should be a point at which video proof is required. Should the requirement be based on leaderboard placement (1st - 3rd) or in-game time (30 minutes or less)?
In the meantime, I'll verify runs in Speedrun Mode by screenshot as long as they are longer than 30 minutes. I chose that time because all of the runs faster than that already have video proof.