I definitely like the wave survival mode for sure, and it makes sense to have increasingly better reward gains, but I think it shouldn't be restricted to just planetary resources. Maybe the bosses drop something like a "lucky/special chest" would, perhaps better depending on the difficulty. So that much more resources, blues and ammo packs, maybe ship schematics or legendaries, etc.
English
-
A few others have mentioned engrams and other rewards too, added to OP. Thanks!