einfach in der funktion Panelname.pos_x und panelname.pos_y verändern. Zum beispiel so:

playerPanel.pos_x += time_step*3;

oder so:
playerPanel.pos_x = clamp(playerPanel.pos_x + time_step*(key_d-key_a)*5, 0, screen_size.x - bmap_width(playerPanel.bmap));
(ungetestet)

~"I never let school interfere with my education"~
-Mark Twain