What if it is for "purple dosBOX game" - like e.g. Purple Saturn Day?
or more likely Apogee's Arctic Adventure?

Galaxy being released this week is your speculation or there have been hints? :O

Galaxy had an announced release date of August 31, but I heard that it was delayed. Not sure about the delay, since I hadn't seen the original post, so take it with a grain of salt.

se7en the game?

Good to know, something to be excited for then!

Well, if we're going 2D what about Thomas Was Alone? or even Super Meat Boy, at a push...

Let's see what you said:

"Maybe there is no point since an announcement was already made by the developers as for Wacky Wheels?"

"I know, but there was no hint for it since it had been announced by the developers that it was going to be here.
Maybe the same is going on with next week's release, that would explain the lack of hints."

We all knew the exact date of both The Journeyman Project and Legend of Heroes: Trails in the Sky and both games did receive Enigmatic Hints. As I said in my previous post, this week's Enigmatic Hint was for Hugo Trilogy and with the possible exception of the double hint back at the end of July, I can't recall GOG ever doing two Enigmatic Hints for one week (JMich, I know you're looking for the perfect opportunity to prove me wrong).

has anyone guessed Nitemare-3D yet?

Looks like EDGE to me

That would be fantastic but Terraria is strictly 2D, right? The isometric view seems like a problem to me.

I think it will be DROD 4: Gunthro and the Epic Blunder. More Deadly Rooms of Death, but this time it's a prequel to DROD 1: King Dugan's Dungeon.

Mmmh ... a purple cube with some kind of perpetual shadow ....... this is Eternal Darkness ! :p

Are there not already free versions of the game available.
I remember a game called AcidTetris years ago.

As for the next game I have no idea. None at all.

Did anyone say Marble Madness yet? Whoa how crazy would THAT be?