Uninspired fetch quest with sluggish platforming and vanilla aesthetic. Its puzzles are eroge caliber, at best. Those that aren't simple timing based meters are quickly solved by brute forced. Proportionate to the size of the levels, the amount of backtracking is absurd. The time traveling mechanic may as well have been a series of coupled doors, as there are no discernible similarities between rooms of different eras.
My Big Friend is a complete waste of time.