I agree with the other posters. Reading a devlog pretty much means you should expect spoilers. However, if you want to be considerate of those who don't think of that, is there a spoiler tag you could use to hide certain things? If not, you could just make it apparent in your first post that spoilers will be in this thread and/or post a big SPOILERS warning at the top of new posts with spoilers.
Personally I'd love to see more of this as it develops, and I think it'll be fine to just show us new creatures and features without spoiling the game. Since it's Metroidvania there will still be a lot to be revealed through actually exploring the levels and whatever data you get from scanning. You may also get a lot of helpful feedback you'd otherwise miss out on.