I think — did beta testing for someone before, maybe you could ask him some advices on that.
Also it is a rather hard question to awnser, at the end maybe something like:
Does it take long to load in your opinion?
Does controls respond well?
Were there some parts unbalanced in your opinion (like too easy or too hard for a certain point of the game)?
Would you play it again?
Do you think menus are easy enough to navigate?
Did anything that you would not expect happened in the game (not story wise)?
Or something line this