Home level should be unlocked whenever you play this game and the next level button should function well, but I've only tested it with Windows 7 & 8 platform, and I'm not sure about the Mac version... So maybe you could download this game again and see if it works this time.
Wait... No Sound? I've downloaded the Windows version from this page to verify, but everything seems the fine in my computer. The operating system of my computer is Windows 8.1 so I'm not sure what's really wrong. I'm so sorry that this game couldn't run well on your computer.
