You could check out Kingdom Death: Monster. You could use many of your 40k minis as your survivors, and it would come with a ton more minis to build and paint. Alternately, you could try to find somebody selling the game for cheaper without minis, and only use 40k minis in the game.
Warhammer 40k
A community dedicated to the universe of Warhammer 40k, a tabletop setting in the far, distant future.
This is a general community for 40k miniatures, art, lore discussion, and gameplay discussion.
Rules
- Keep it civil.
- No memeposts/shitposts. Memes are great but direct them to grimdank.
- Please mark any posts containing realistic nudity or realistic excessive gore/violence as NSFW; this rule mainly applies to cosplay and realistic drawings rather than miniatures. Being that 40k is inherently violent, this is a judgement call, and mods may occasionally request posters add tags.
- No political or social cause agenda pushing.
Helpful Links
- 10th Edition Rules
- iOS Warhammer 40k App
- Android Warhammer 40k App
- 3rd party site for running Kill Team games
Related 40K Communities:
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There's also Five Parsecs from Home, which is a solo wargame / RPG. You only need a handful of minis, and it's miniature-agnostic so that you can use any mini you want.
Hey! You should look at Blackstone Fortress it's set in the 40k universe and is a 1-5 player coop game. You'll get all of the minis to play the game, no more no less, so there's not really room for growth but I believe it's in the same vein as Gloomhaven.
There is this thing being developed for you to fight solo/co-op against a huge swarm of Tyranids, it might be of interest! https://www.goonhammer.com/fury-of-the-swarm-the-40k-co-op-open-beta-begins/