100% of achievements unlocked; all waves completed for all sectors; all weapons and equipment purchased. I played the heck out of the shareware version on my very first PC, years ago, so when I found that this had come to Steam it was pretty much essential to pick this up at some point. While undoubtedly nostalgia will be an influence on my opinion, this was still good, if fairly mindless, fun to playthrough, and this time get the full experience. The upgrade mechanic afforded by the supply room keeps the game compelling as you see your plane becoming ever more powerful from mission to mission and there's a fairly good variety of different enemies throughout.