Samarost
I just read about an amazingly well done, award winning flash game called Samarost 2. I played through the first level in a few minutes, and it was terrific fun — kind of like the old Sierra and Lucasarts adventure games. From the website you can also play Samarost 1, which I haven’t checked out yet. Samarost 2 is free for the first level, but to play the other level you have to pony up $6.90. Tempting…

I showed this to Lindsey, and she of course had already played it “like 10 years ago.”
