You could improve on the background tile set to make the parallax scrolling more natural? Try a more genesis accurate color scheme, and more sprites. {Custom if needed, but ask permission from creators}
27:30 if you wait until the things come out from the wall on the screen left up above you can get all those 10 monitors and invisibility monitor too thats how you get those monitors and if you collect over 50 rings before you get to the things mentioned you can go up to the next level even after leaving you can go back in to go up only with 50 rings or over not under but you only can get those other monitors from the level you are on before re entry of the lift take care everyone