Most profound Flash game you ever played???

Sticking strictly to profound:

Dark Cut 3

Viricide

Soul Searchin'

Sequester

Sequester tops the list hands-down as far as profundity and emotional impact. Soul Searchin' was probably more profound strictly speaking, but it didn't take my breath away the way Sequester did.

Expanding to "flash games I enjoyed a hell of a lot and which had some kind of emotional, intellectual, or psychological impact on me" (the above are included):

The Dark Cut trilogy[1][2][3]

The Killer Escape games (currently 2 games[4][5], but I believe a third is on the way, which I'm very excited for)

You Find Yourself In A Room

Mystery of Time and Space

Exit Path

Coma^* I remembered it well enough that when Limbo was released years later, I thought to myself, "This game seems suspiciously similar to Coma." I still to this day can't help but wonder if Limbo drew inspiration from Coma, even if accidentally/unconsciously.

Kagi Nochi Tobira (2 games[6][7])

While checking to see if any of these had TV Tropes pages, I discovered The Company of Myself, by the same guy who made Viricide and You Find Yourself In A Room. It may make the list, once I've played it. And then there are games which I really enjoyed but don't recall the names of (and don't feel like trying to find right now), and in some cases haven't finished playing.

And really, there are so many flash games out there (and web games in general), there will always be more gems for me to stumble upon. For instance, I am currently browsing the Web Games page and just discovered The 99 Rooms, which looks like it'll be going on my list, and there are many others there I've never heard of but which sound really cool, not to mention ones mentioned in this thread.

At times like this, I'm reminded how big the world of web games is, and I am overcome with an urge to browse /r/webgames again because I know it's only a matter of time before I find something awesome.

edited 12th Jul '14 1:44:51 AM by NoriMori

If I ever somehow managed to get to creating my hypothetical Flash game, then it might fall in here.

It's a Boss Game Shoot 'Em Up where you play as the boss instead of the small ship. Kinda like Boss Rush but each playable boss has multiple destructible parts that can attack individually.

edited 12th Jul '14 10:34:38 PM by ironcommando

It's not a Flash game per se, but A Dark Room impressed me for how it managed to hide several plot twists by virtue of the player only having the ability to understand the world and player-character via the text descriptions. Plus all those subtle little hints, like your village's odd interest in teeth and meat, the first battlefield you find littered with both modern and alien weaponry, the odd separation of the Wanderers from the rest of the enemies and NP Cs in the game.

The Submachine series. The setting itself is incredibly curious, the story is complex and supports lengthy speculations^* as shown itself in extensive theories found in the standalone exploration game. Also the design of many locations is simply fabulous. Including excellent soundtrack by Thumpmonks.

All of the games made by Edmund McMillen but more speficlly his Badlands series about balls with eyes called Dumplings and hulk whales called Dreamshamsers. It was also how I discovered a certain game of his.