What apotheotic said is correct, it's quite different to Outer Wilds. That said, I obviously think it's still worth checking out. I am probably biased because I live in Scotland, like hillwalking, and like Scottish folk music, so it was hitting a lot of personal delights for me. I do recommend it all the same, as the art style is lovely and the frequent moments of "ooh, what's that in the distance and how do I get there?" are a lot of fun

I think the closest experiences to OW I've had are:

• Return of the Obra Dinn. I think everyone knows this one, but in case you haven't played it it's more focussed on story and detective work over the exploration of OW
• Sable. Movement is really fun and the world is cool to explore, but the quests are a bit shallow. I recommend going into the graphics settings and choosing the high visibility colour option, it looks much nicer
• Heaven's Vault. Great story and a fascinating setting, but the moment-to-moment gameplay is much less fluid than OW

I think all three are great overall, of course, especially Obra Dinn

(also if you have your own OW-adjacent recommendations I would love to hear them)