Talk about power creep. The Shadar Kai get free cantrip AND teleport with resistances. That's better than all the high elf shinanigans right there. Granted, the three cantrips are kinda lackluster - Thaumaturgy is probably the best of the lot, and that's saying something. Chill Touch isn't bad for a necromancer type, but at this point in the game, the only CHA option is Shadow Sorcerer. Everyone else generally has better options available, and even then? I've found that despite the huge lists of cantrips, very few people take a ton of damage cantrips - usually two at most, leaving Mage Hand, Minor Illusion, Light and Prestidigitation-class spells. Light isn't exactly a big demand if race gives darkvision as well.
Wing elf is going to be rated as OP, just like all the other winged races. Which is... pretty fair in this case. No +1, which means that they're going to lean towards DEX weapon classes, and we all know what that means - more gripes about kiting and flying while staying out of reach. We're literally designed to lean towards some of the worst flame threads of 5e.
Grugach... yeah. Just huh? The only thing I see going on here is we have a Strength elf for maybe going barbarian? The druid cantrip is almost always going to be Guidance or Druidcraft - all the others rely on WIS in some way, and that's an off stat. People generally don't like off stats, in my experience.
Sea Elf is pretty worthless outside of a sea game. Could see it taken for just that, but too situational to really care about it. I do love sea games, but you really need to enable the whole party, not just one person.
All in all, lackluster.