I saw Deepworld in action in March at GDC in San Francisco. It's a Minecraft-style 2D sandbox game, with lots of fun steampunk elements and mechanical contraptions to make. A little while later, the game's developers held a Kickstarter to try and get a Mac beta off of the ground, and though that Kickstarter didn't get funded, the team has moved forward to a launch anyway. Deepworld for Mac is now available for purchase on the game's website. For just US$5, you can get a game license that will eventually be good for all of the game's platforms, and if you buy ri