Thanks! It looks, plays, and sounds good. Sound effects are cool. I'd like to see it on real hardware so I can see how the flicker looks, but I don't have anything set up at the moment.
I had a few issues with P/M pixel garbage. Usually just one or two pixels, which later got cleared out. I also had the main player sprite get drawn kinda weird/distorted. I'm just testing in Altirra. No screen shots right now. I can take some later when I've got more time. You want save states?