Seems not very hard once you realise that you can repeatedly construct and deconstruct O2 tanks to move long distances without increasing resource usage. Maybe worth changing so that O2 tanks have to connect back to base?
We're doing both for the post-jam version! One of the things we didn't have time to implement for the jam was an additional pick-up resource layer, where you can boost your economy shortly with found loot, which should help with the rising difficulty level (and promote expansion in other directions). We'll keep the page updated :)