i did not enjoy echoes of the eye as much as the base game. i haven't seen credits again yet but i'm done with everything on the Stranger so these are my thoughts about that.

positive

• the Stranger itself is really cool. i like it as a concept, as a space, as a craft, and as a traversal experience, which is really important in Outer Wilds
• i like the owlk architecture and what glimpses of owlk culture we see; for instance, the idea that owls wouldn't want to read books because of their poor short-range eyesight so they use slide projection for data storage
• i like the use of light for everything in the dream world. it's one of the few unlimited resources you have in Outer Wilds and making you use it strategically is very interesting. it's also telegraphed well by the doors and rafts in the Stranger
• i like that the dream world is a simulation and that using that fact is important. it's easy to guess, but not guaranteed to guess, and either guessing it or finding it out in the Forbidden Vault is pretty rewarding
• the commitment to layered design is mostly awesome. it really feels like the olks would have used everything that's in the Stranger, and that its utility to you is often incidental or only due to decay and the passage of time. this was true in the base game as well, and i'm glad it wasn't lost

negative

• either guessing the simulation thing or finding it out in the Forbidden Vault is fun. having already guessed it, going through all the effort to get through the Endless Canyon stealth section just to find out this thing i already knew was... not awesome. in general, there was very little way to know what might be in each Vault, which wasn't as much of an issue in the base game
• i really dislike the combination locks. all eight symbols - Stranger, owlk planet, eye (or sun?), star, fire, and three moons - seem to pretty clearly represent things that exist in the game world, and especially the presence of multiple moon phases had me thinking i could logically figure out the codes that were missing from the Cinder Isles code room. that's not true; aside from the one that has a direct effect on some simulation-only elements, the codes are either just given to you or not necessary at all.
• i don't like how linear the information acquisition phases are. in the base game, you need dozens of pieces of information, and you end up returning to several areas many times with new things to try, new answers to look for, and new context. i don't expect that much content from a new game, but i do wish each area had more than one useful piece of info or interaction to do. for instance the Underground Lake is really only useful for the endgame sequence; you can use it to get to a vault, but only if you already know the technique that vault reveals.
• while I liked the owlks as an idea, i wish we'd gotten to know more individuals, like with the Nomai. meeting Solanum made me cry (twice!), but meeting the Prisoner was... very underwhelming, especially since we don't even learn who they are until we meet them. i think the reels and vision staves could have absolutely allowed for this; just give them different robe colors or something.
• this, plus seeing the owlks shield the eye and imprison the Prisoner, makes me... not really very sympathetic to them? the Nomai made the wrong choice, but as a player i, at least, understand why and sympathize. the owlks just seem like carceral jerks

this long list of negatives kind of makes it seem like i don't like EotE, but that's not true. i had a really good time playing it, except for a few brief periods of annoyance. it's a really good DLC, and it suffers only from being DLC for the best game i've ever played.

EotE good. i just think it could be better, and i want to take inspiration from that!