The updated demo wipes the old demo save because the new one is going to be compatible with Early Access review. This way you can keep your progress from the demo after you decide to buy the game.
Graphics assets for Patron's skills were reworked by amazing pixel artist - Piotr Wronarowicz.
Some skills and spells have been rebalanced. If you're lucky you can even meet a new patron after clearing the first boss of Hell :)
Widescreen support is finally added as well as custom resolutions in windowed mode.
You can now select one of three save slots but you can no longer "Reset demo" progress.
This is the last demo update before Early Access release. Some bug fixing will happen for sure but the content of the demo won't change anymore.