Hello,
Thank you for trying my asset!
This asset hijacks the application surface to use as the basis of the simulated CRT screen. If you want your HUD to appear on top of the CRT screen, then you'll need to draw it after the CRT object calls crt_apply() in the Draw GUI End event. Alternatively, if you want the HUD to be included inside the CRT screen, then you'll want to draw it directly to the application surface in the Draw GUI event using surface_set_target(application_surface) followed by surface_reset_target().