Mobs:

My first idea is the bacteria spiders from the moon, their mechanics would be that they would attack like zombies from a long distance and in large groups, when they attack they will give the player a debuff on hitting them (be it slowness, poison, or any other kind I am unsure).

Crafting:
I find making your own laser ammo tedious and not worth it, only 1 shot for an electronic circuit and arrow seems wasteful and much less efficient than just killing mobs that drop them, I say up the output for them to rival just killing mobs, shouldn't have to pour 20 iron and redstone into just 10 shots

I agree with these ideas; however, I recommend sticking to one theme per thread. Otherwise it may look like the following, which, though it did have a number of good ideas, the poster admitted was a lot to process at once.

https://swdteam.com/forum?p=thread&tid=72

By the way, I see this is your first post. Welcome to the forums!