Oh it looks really great downloading to try and gonna follow to know when its released to buy, ur gonna release just on here or plan on steam too?
No need to buy! When the game finally is released, it's going to be free, and should be compatible with saves from the Demo. Even if saves won't transfer over, I'll make sure to work something in for those who did play the demo (maybe like unlocking the Cheat menu for players trying to load old saves). Either way, I really hope you enjoy!