Hi there; I just updated some mods and added this one (to my current save, not to a new game) because I read about it in the changelog of Wooden Industry and thought that could be a fun addition.
However, I'm not sure if Crushing Industry has some issue with Muluna or vice versa. There's no crash, but there's some weirdness going on with the (space) crusher I think (I have that enabled since it's default).
With both mods Muluna and Crushing Industry enabled:
From the Muluna mod, there's a technology "Crusher" right after researching "Moon discovery Muluna", which unlocks a recipe "Space crusher".
And then there's a technology "Space crusher" requiring techs Quality module 2 and prod science pack, which unlocks a recipe "Space crusher", too.
I believe they're the same entity (alt-left opens the exact same item in Factoriopedia). For Muluna, this item seems overpowered at that stage (crafting speed 2, prod+25%).
But even more seriously, I suspect that the tech progress is locked, since crafting crushers is needed for Muluna to get space science (which is produced on Muluna, not on a platform as in vanilla), which in turn is needed for researching quality modules 2 - which in turn are needed for crafting the (space) crusher... I haven't checked this (in my save, I already researched Muluna's crusher), but looking at the tech tree, it seems so.
With only Muluna enabled and Crushing Industry disabled:
Now, the "Crusher" technology from Mulana unlocks just a "Crusher" (without the "Space" prefix your mod adds, obviously) which is more reasonable for that stage (crafting speed 1). I believe that is the vanilla crusher just moved to a different tech, though I'm not sure.
With only Crushing Industry enabled and Muluna disabled:
The tech tree seems ok at first glance; the vanilla space age progression leads to space science craftable on platforms, thus researching quality modules 2 is viable, thus your tech Space crusher tech can be reached.
I'm not sure what's your intention, whether you want to keep the vanilla crusher and add a more powerful space crusher, or if they should be the same entity. But then it seems the tech tree doesn't add up (with Muluna), as described above.
I'm also not sure whether you would want to strive for compatibility with Muluna. I try playing with many planets enabled, so I have Lignumis and Muluna besides others; Lignumis requires Astroponics, which supports Wood Industry, which supports Crushing Industry.
True, Muluna makes no claims regarding compatibility with Wood Industry and vice versa, but that's how I ended up here in the first place, and if you want to and it's compatible with your future plans for this mod, I'm sure you could come up with a solution. I'm happy to provide more details if I can (I'm not a modder though).
For now, I guess I just switch off your config option about the conversion of the Crusher to a Space Crusher and see where that takes me... (btw, as an aside - don't you think adding a quality bonus by default to the entity is a bit too much? Not because it's not lovely, but because then you're forced to handle quality whether you want to or not, instead of deciding by yourself whether to put quality modules in the Crusher...).
Thanks for reading and replying! :-)