I'd just like to reiterate how great
Aquaria is. Everyone should give it a try.
WoF*, intelligent no-nonsense MAGICAL MERMAID protaganist.
Dynamithix, swirly, pseudo-aerial dogfight combat.
Bullet Magnet, enemies including giant nautili, giant jellyfish, and, erm, giant
predatory tunicates (which are actually fucking terrifying in-game).
Jordan, monster design like a Japanese Mega Drive game.
OANST, it's a exploration game with painterly graphics with ridiculous amounts of hidden areas and crap to find, and it's made Derek "Spelunky" Yu. Yeah, yeah, your back. The SteamBox is a confirmed thing that's going to happen by Valve, so if you ever get one you'll have no excuse.
Manco, mystery upon enigma upon conundrum. It's like the Twelve Monkeys of the gaming world. Every unusual object and detail in this game is significant and relevant, though much of it won't make sense until the second playthrough. Even then, you'll have to either learn to read Aquarian (which isn't too hard; it's just a Roman substitution code) or replace the symbol sprites to see everything.
And Phylum, my man, this is "Use of recurring musical motifs to induce paranoia: The Game". Without wishing to spoil anything,
music has power here, and it's perhaps the only game where the
soundtrack is improved by a second playthrough.
*I say "Wofe"