Yes they were all SS:RE keys. Although, now I like the idea of a random games. We're open to suggestions for next time. We could do 3 separate posts, spread them out on Twitter/FB/Forums and reward retweeters etc too. The point is - we love you guys and love indie games.
Personally, I'd suggest keys for unknown or random games. When I saw your tweet offering keys if you reached 1000 SS:RE sales, it seemed a little odd that it was encouraging users to buy SS:RE in order to unlock SS:RE! Just a little - as someone who buys it might want a copy to give to a friend, for example - but I think keys for unknown games might be more enticing.
Also, with unspecified games, it increases the chances that takers may already own the game in the IGS library. In that scenario, it gives other who are trying to redeem it a slightly higher chance of being successful. Just my opinions, though.
Edit: I missed out on Megabyte Punch and would be stoked if I randomly unlocked it with a key giveaway, for example.