I also appreciate a lot the idea of having some sort of time restriction on secondary objectives, as long as they are telegraphed clearly enough to the player and reasonably forgiving.
With a the caveat that I tend to dislike when it becomes a matter of choosing between CONFLICTING time restrictions. That's a thumb down from me.
For how I see it a game of this type needs to be designed in a way that makes exploring 100% of the content if not *easy* at least reasonably doable, ideally with time to spare if you optimize well enough.
