Greetings fellow time travelers,
I'm working on achievements (and some other stuff) at the moment, but I won't be releasing the update allowing you to earn them until some time next week. I hadn't meant for the achievements to show up in steam until then, but must have configured something wrong, because they do show up; opps :)
Also in the works, hopefully to be released next week, are a free demo showing the first 8 levels, and various tweaks to levels to further tighten the early game.