You can download the Gallery's games and play them on your own computer.
Source code
Choose this if you want to build the games yourself, or investigate how they work.
Linux
Packages coming soon...
Mac OS X
These are unsigned, so your computer may complain about running untrusted programs. I'll fix this if someone sends me a free MacBook and $100 for an Apple Developer account.
Windows
Coming soon...
Bugs?
If you find any problems, report them on Bitbucket.