Stretch goals question

I have a question with 300k reached someone asked wether there is after that possible to get a linux version when sometime the stretch goal may be reached… or do we have to reach the 1.5 mil in the kickstarter?

Some stretch goals will be able to be completed out of KS, others not, @INovaeFlavien could clear this one up for you I guess.

Seems a dev answer so can ask this here too:
Some ppl seem to ask what 2nd copy of game they get alongside their 100$+ tier?
Just that one or…

Eg 150 name a ship, can the second copy also name one or… just basic 20$ version?

I assume it will be something similar to this: $2,500 Pledge Tier