Some impressions:
-Astral Elf, not much about them stands out from other types of Elves, I know previous editions had this sort of subrace, but I felt they were mostly taken by the "Eladrin" Elves.
-Autognome, I remember those Tinker Gnome creations, and I like how it's gets around the construct type issues by being able to be affected by Healing spells, and having mending allow the healing with the cost of a hit die. I feel other construct races are probably going to end up like this one. They lack the electrical attack they had, but at least they won't randomly explode.
-Giff are a rather simple "big" race with the damage dealer trait.
-Hadozee the main thing is bonus use an action, we've seen glide before as an ability with the Simic Hybrid (which could be Xixchil Hybrids in Spelljammer).
-Plasmoids I like as they're unique in being oozes, though I see in many cases they might leave behind clothing and armor to fit into tight spaces. Should Shape Self allow a Plasmoid to don armor as a single action?
-Thri Kreen is a good way to deal with extra arms that might have made them too powerful, yes it means they could use a heavy weapon and wield a light weapon with two-weapon fighting. I like that they used what's inspired by the Chameleon psionic power. They've removed the natural attacks and poison bite though, those things could have either been too powerful or too weak.
dnd.wizards.com
