This is an update to the conversion of Spiff's Astrostein mod I did last year. Much like my "Halten Sie" update, this adds higher resolution graphics, floor/ceiling textures, light levels, and many other updates! There are two versions - one has 64x enemy sprites (from the WolfenDoom version) and the other has 128x enemy sprites (from the original Mac version). Check out the txt files within the pk3 for more info!
Spoiler: CHANGES FROM ORIGINAL
64x enemy sprites version
128x enemy sprites version
MAC VERSION PC COMPATIBILITY FIX