Thank you for sharing all of that information. I just completed Level 4!
You put a lot of thought and effort into your game. The PAL/NTSC filter is very useful for those playing on real hardware. I'm new to Atari games and wanted to check out some homebrews and I spotted your game on the homepage of AtariAge! The list of homebrews you shared will keep me busy.
Thank you also for sharing the cover art. William Thorup has designed other covers I've noticed and they are all very good! My next game queued up is Axercise!