I played the shareware version for years, and I loved every second of it. It's a unique game and when I finally got to play the full version (not to be mistaken by the 2.0 REMIX version which I didn't like much because of the changes it made to mobility and the game itself) I had a blast like never before. The bosses, the unique weapons, the verticality, the maps, the vfx, the sound effects and the music! Specially the music, OMG! I can still hear it in my head whilst writing this. It was an amazing experience back in the day that got lost in history.
I really wish this game to get the GOG treatment. It deserves it!