No! We're proud to say that Crypt Run uses absolutely NO DRM.
Yes! We have Humble Store integration, which supports PayPal: http://www.cryptrun.com/buy/
That would be sad :( We will happily refund your money, grant you an in-game reward equivalent to $15, or come up with another way to make you happy. We won't rest until you're satisfied!
YES! If you've pledged $20 or above, and the stretch goal is met, you will be able to receive a Wii U eShop code for Crypt Run.
Yes, eventually. However, we want to nail the desktop/console experience first. We'll investigate mobile after the final game ships.
Don't see the answer to your question? Ask the project creator directly.