Here's some research I did on Rebelstar Raiders . One thing which I really like about the Rebelstar games is that the moonbases and other installation appears functional. It's not just random mazes and rooms with crates. The first game had 8*8 px characters, and if the maps use tiles it doesn't show at all. The later games (Rebelstar 1 & 2) moved to 16*16 px characters, and then Laser Squad introduced character rotation and an angled perspective (not isometric though). X-Com inherited a lot of combat mechanics fom these older games, an in some ways it was inferior in that department. I think the machinegun fire and aim control works better in Laser Squad. You can spray X number of bullets between two arbitrary points. It feels really Rambo.