I remember spending quite a long time of my early MMOing playing A Tractor [http://www.gameislands.net/], which was Alot [http://3.bp.blogspot.com/_D_Z-D2tzi14/S8TTPQCPA6I/AAAAAAAACwA/ZHZH-Bi8OmI/s1600/ALOT2.png] of fun. Virtually empty, however. A Tale in the Desert, too, but since I found out about that through Tobold, I'm guessing it's not as obscure as I thought.
I was going to say Samorost 2, but a.) someone's already mentioned that, and b.) since the guy did Machinarium, it's not particularly obscure no mo'. There's an awesome little flash game called... I forget, but it's some sort of pixellated wonder (edit: Small Worlds [http://www.gameshot.org/?id=4224]. Play it! It's wonderful! I'm not sure if it's obscure, because there are so many bajillions of Flash games out there, it's hard to tell what's popular and what's slipped under the radar. I hope this is a popular one; I really like it).
I was going to say Samorost 2, but a.) someone's already mentioned that, and b.) since the guy did Machinarium, it's not particularly obscure no mo'. There's an awesome little flash game called... I forget, but it's some sort of pixellated wonder (edit: Small Worlds [http://www.gameshot.org/?id=4224]. Play it! It's wonderful! I'm not sure if it's obscure, because there are so many bajillions of Flash games out there, it's hard to tell what's popular and what's slipped under the radar. I hope this is a popular one; I really like it).