Well dude, playing casual games in windowed is alright, but when it comes to immersive, story-based games I really think they need to be played in full screen for full effect and to really draw the player in. Imagine playing a game like Half-Life 2, Silent Hill or Doom 3 in a 640x480 window on your desktop. The games would kind of lose a lot of their immersiveness, and that's kind of what I'm trying to get at here.
Err yeah, no offense but no game made with some construction kit is ever going to be in the same league as games like those. It'll be mildly amusing and possibly get it's 15 minutes of fame like Darwinia, World of Goo etc., and that'll be it. Even then it would have to be really, really good and really, really unique, along with some great PR. No, yours or anyone elses will not change the way people think about games, it wont be the next big thing, it wont make you a million dollars, and apparently it wont run in full screen at the correct aspect ratio either. You hear so many people who are going to make the next big thing, with this, that and something else, and it -never- happens.
Out of the thousands of games doing the rounds, there's a reason you only listed those three and none of the great many 2D games out there.
As for immersion. If it's any good, then it shouldn't need to be full screen to succeed, should it? That's like someone insisting they need Photoshop so they can draw better pixel art.