Pretty much top-down Doom. Great game!
Nice Nice but no music.
[update] Changed two monsters sprites to make them more visible
[update] The player will now climb very quickly small steps instead of jumping
[update] Discovered money boxes are now visible in the map (yellow marks)
[update] Added a small 100% icon when 100% of the level is completed
[update] After completing the game the player can now hold more weapons and upgrade them
...and more (limit reached)
This version is a sequel to Alien Zone. It features over 30 brand-new levels.