You can no longer donate VIA Kickstarter, but you can still donate using Paypal:
link------------------------------------------------------------
If you donate $15 you can get a DRM-Free or Steam copy of the Digital PC, Linux, or Mac Key.
------------------------------------------------------------
If you donate $15 you can get the PSVita or PS4 Version.
------------------------------------------------------------
If you donate $15 you can get a Wii U Version.
------------------------------------------------------------
If you donate $15, you get the Digital Soundtrack.
------------------------------------------------------------...
