Endgame

I am not sure about the designed solution. It is easy to drop the FD on the win and it also easy to guide B to the win. In both cases, I did not use most of the structure.

@Issac Peter - Welcome to the authoring side of Mekorama. I see you've been around are a bit. I gave your level a go and like @GFJ say, I don't know what you intended as the win but I won with the free draggable (FD). I slid it up the stairs and onto the win. I assume, the FD was to fill in gap someplace for B to cross or to push B onto the win but my B didn't even move. I'd recommend to not use FD as all draggables should be anchored with a slider.

Very easy puzzle. Lots of stuffs I didn't use, I just use 1 slider and free draggable to create a path for B, not a fan of control FD like this, very hard to fill the path to win.

Like @Meko Guy, I just slid the free block up the stairs and dragged it over the win. B never moved, which was probably a good thing since you made him blind (no eye) and he might have hurt himself ...

Spoiler: Endgame

I didn't use the free draggable. Since the clue was "endgame" I thought US football, and went for the extra point. After about 5 tries, set B up properly for a kick right on top of the button.

@wbogacz .. yes that is the way i won too. I am also an avid NFL fan so must be some subconscious influence in our gameplays.