That was rather odd. I mean, it was basically just me being in this shoddy environment. The sprites really stuck out. They probably should have been drawn. Yes, I know it's faithful to the original game, but it was just weird. The color seemed off.
I didn't get you had to press the button after typing in the level code. I could get through the rest of the game well. The music wasn't bad. It reminds me of that bad "Doom" movie. It did have that one good scene though!