This is just a heads-up for those who find Space Hulk Death Angel too hard or too easy: your best bet at tweaking it might be to change how many players you have at the table. The math behind the various void lock cards is not exactly even, it has some swing to it depending on number of players. 3-Player games are much harder than 2-Player games, for example, which was a big shock to us the first time we played 3-player.
In order from easiest to hardest, the configurations would be:
Solo game (easiest)
2-Player / 4-Player
5-Player
3-Player / 6-Player (hardest)
The math on the void locks leads me to say 2-player is about 25% more difficult than 1-player, 5-player is about 50% more difficult, and 3-player is 75% to 100% more difficult than solo.
Marines die really fast in 3-Player, thanks to the "auto-kill" major Swarms of 5. About a third of the cards in the Event Deck generate TWO of these killer swarms simultaneously in 3-Player mode. My wife and I win a lot more often than we lose in 2-player and have done nearly as well in 4-player with friends, but IIRC, I don't think we've ever won a game with 3, 5, or 6 players.