Alien Carnage | 1994 | Apogee Software (Platform)
Apogee made plenty of great sidescrolling games in its heyday, and Alien Carnage (a.k.a. Halloween Harry) is no exception. If you're looking for a blasting good time, look here. This game was released as freeware in May of 2007.
Full Version (5.16MB)
Official Site - Shareware & Freeware Versions, Other Games