funny game, old timer, and to those who complain graphics and sound i guess you have no ideea how the beginings were. such games are created as tribute for those starting periods.
the trich to destroy the squared robot is to throw the cat at the critters above to fall on the robot. to avoid the "bullets" you must stay on the ground and let them shoot, they'll come lower so you can jump over them. and while you jump try do do a double-jump and throw the cat at a critter to fall on the robot. is not that easy, you must time it right and syncronize it well to manage, plus you must do it several times.