Made it to 2-4 and unlocked CW3, who I'll of course be using for the rest of the game.
Good thing I like him, considering the next (non-hidden) character looks like he'll take forever to unlock!
Edit: Well that was an "interesting" level. I jumped off the checkpoint ledge with CW3, and ended up just floating in space forever.
--
Our eyes were removed
For our own safety.