It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

×
The game takes up 30+MB, but the installer is 369MB.

Why?!

The Humble Bundle version has a 40+MB installer.
Most likely it also contains installers for dependencies, like DirectX or .NET framework. ;)
Another possibility is that the huge size of the download file is caused by the Japanese version. In this case, I would be curious to find out WHY the Japanese version is so much bigger, double-byte characters alone don't explain it - more or different content?

Odd.