Are there any games that were on sales but you didn't manage to buy them?
For me, it's Summoner.

well, probably Omerta DLC Japanese incentive, partly because of the the insanely bad reviews - missing patch that steam already have, partly because of my thought of the repetitive nature of the flash sales. But it never repeat... :)

another one maybe Primordia, I tell myself maybe I should try that after the fifth time it go expired, but I don't know that the fifth time is my last time seeing that.

Missed nothing per se, but I've skipped a few that weren't as highly discounted as I would've wished.

I meant to buy the first Witcher but somehow forgot.

Red Faction >_> I couldn't decide whether I wanted it or not...and when I finally decided, Gog didn't put the flash sale back up. It makes me realise that this kind of sale was pretty terrible.

Some games I still haven't decided whether to buy or not.

I'm slow.

I could never decide if I wanted the Shadow Warrior series or not.

^ Same as blotunga, plus I've skipped some titles I wasn't sure about.

I Have No Mouth And I Must Scream

That also, like the Risen Collection, where I have the games on Steam but not the DLCs for Risen 2. Finally I've decided that I have enough games for now...

I'm sorry that you missed so many games that your mouth fell off! : (
(lol I know the game)

I was planning to buy Kentucky Route Zero, waiting for it to come on a flash sale. I saw it in the flash sale horizon at some point, but it was late in the evening and I had to get up early the next morning, so I went to bed.

Nope. None at all.

Thank you for feeling my pain... I can only type AHHHHHHHHHHHH to express my self.. hehe

Yeah. All of them.