Remains don't spawn when modded in enemies are killed and could use a more realistic texture. (They're supposed to be pieces of the aliens right? Chunks of meat?)
This mod is in my top ten favourites by the way. :)

Hey,
Sorry for answering this so late :)

I've made a few changes in response to the upcoming Factorio version 0.15.
In the new version the aliens don't drop these remains anymore, instead you need to retrieve it with pumpjacks :)

I'm aware that non-vanilla enemies are killed doesn't drop any remains. I haven't added that into this mod.

I'm glad you like the mod! Your feedback is greatly appreciated!