All of us Protobird Games are confident that you will fall in love with the story and characters as much as we have. If not, keep the pdf files as our gift and feel free to cancel your donation. No hard feelings and thanks for considering us.
The exact stats on the Kickstarer Exclusive cards is being worked out. But they will have exclusive art and animation, (all cards are animated!) and some type of special ability. The card level will depend on which type you get with your reward package- Epic or Legendary. The progression order is Base -> Epic -> Legendary.
We are planning on making a web or PC version, but not until we've launched tablet versions for iOS and Android. We'll be developing using the Unity engine, which provides platform versatility. But the user interface will initially be developed for tablet.
The current plan is to provide a free version in the App Store for iOS and Play Store for Android (so let's hit that $40k stretch goal!). In-app purchases for Booster packs, specific cards and other offers will be available. We will include a specific code for each backer that unlocks their perks within the app.
Don't see the answer to your question? Ask the project creator directly.