I just tested it:
the reason is the bloom shader. ( I removed it, and the game
feels fine when playing...)

This might cause a delay in the actions verus the visible frames.
So the movement appears some frames after moving the object.

Its not really the FPS, as i can run it with about 50FPS with
the bloom shader. and 60Without,

but the lag can be felt with bloom on.

(maybe useing the time_step then gives wrong values when
the displayed framelenght is different to the actual one...)

Easy Fix: just make the bloom as option in the setup.