In a similar vein, has anyone here played:
Eternal Daughter:
http://www.derekyu.com/games.html (Freeware Metroidvania game; really good)
Aquaria:
http://www.bit-blot.com/aquaria/ (undersea Metroidvania type game also co-done by Derek Yu of Eternal Daughter fame. It's not freeware)
Emberwind:
http://www.timetrap.se/emberwind/ (Ghouls 'n Ghosts type action-platformer by Swedish developer TimeTrap; I think this game's really fun, I like the art style, and is worth the 10 bucks or so.)