Suggestions:
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1] After experiencing touching one other artifact, than first, unlocks some new content in previously visited areas.
=> So this would either be the Astrape or the Laurion artifact, in current content terms.
=> Could gate some content based on then how many artifacts you collect. Having both, might unlock something more.
A) Unlock something at original rover location (where got first artifact).
B) Unlock something at lost rover.
C) Unlock something at talos lasers.
D) Unlock something at laurion computer.
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2) Having more than one artifact active, lets you set one item to appear at Talos at the start of the loop.
A) So you could start with the CO2 scrubbers, to repair the tram at Santorini, as an example.
B) Or you could start with the power coupler / empty power cell at the dam crates.
C) Or you could start with a fuel cell from Santorini.
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3) Having more than one artifact active, raises the stack size of all items, by +1. So three total active (including first one allowing loops), is stack size of 7 (+2 total)
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4) Can salvage certain things for resources.
A) ie gain 5 plates and a coupler for disassembling a water recycler, that you don't intend to use.
B) ie gain rotors for disassembling the mining machine, instead of installing the advanced rotors.
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5) Unlock methods for enhancing consumables.
A) Find an electrolyte package, that you can add to a water bottle or two small water bottles. Adds +1/0.5 water to them, but causes you to lose 0.5/0.25 food.
B) Find a mr.noodles flavour packet, that you can add to a ration pack or two basic foods. Adds +1/0.5 food to them, but causes you to lose 0.5/0.25 water.
C) Find a reactor accelerant, that you can add to a fuel cell. Adds 33% more fuel, but deals a small amount of damage to your oxygen generator (like with surges).
D) Find a battery capacitator, that you can add to a power cell. Boosts storage of power by +100, but increases drain rate of all vehicle actions by +0.25.
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Anywho, if you release a new build that needs testing give me a shout, otherwise check back in a few months, for Pneuma or Strabo or even Santorini.