I saw that you had put free development on hold to work on the steam version. When possible could you link that someplace? I looked around a bit and didn't see the game on steam so I'm assuming it's not up yet.
it's not technically a commercial copy of FTL it's more of a copy like when you make fan art of something someone made. it falls more under fair use i think because it's more of a copycat image rather then copy and paste of the original game