Back in the days before Space Hulk was common as muck, gamers spent a lot of time and energy discussing possible replacements. Claustrophobia was a game that got mentioned a lot in those conversations, and I never understood why. Not because it was a bad title, but because it shares almost nothing with Space Hulk other than asymmetry, a collection of finely sculpted figures and some six-sided dice.
Instead of a pre-set grid, Claustrophobia has a randomly drawn series of dungeon tiles on which the precise positioning of your forces is meaningless. It’s virtually all melee, with ranged combat restricted to the occasional “blunderbuss” card that has a range of precisely one tile. Cards feature heavily in Claustrophobia and not at all in Space Hulk. I could go on.