Hey,
the release date for the upcoming second demo has changed from 4th November 2015 to 1st October 2015. So if you think about to download the game now, I'd recommend you to wait for the second demo.

Here is a list of changes:
-Seth in his unleashed form is controllable now, he is also able to use unique skills
-Seth won't be able to summon Ammit anymore
-Isis' Magick+ skill "TP Transfer" isn't available anymore
-Isis has a new skill called "Teleport", which allows the player to teleport to important places such as the villages and the main temples, to reduce unnecessary and annoying paths

-It is possible to upgrade weapons and armor to +25 in the second village
-It is also possible to upgrade skills in the second village (standard -> II -> III)
-It is possible to increase Life- and Magick Points with rare and mostly very hard to find new items... have fun searching them

-Better language (thanks to Chaikster, a native English speaker who did proofreading)
-Skill description contains damage formula now
-Temple of Osiris is not as dark as in the first demo anymore (opacity from 185 to 135)
-Equipment upgrading system is a little bit faster now
-Enemies give a little bit more reward (experience and money)
-Re has another voice now (Simon "Iron Croc" DLSea)
-Isis has a voice now, too (Crazy_Leen)

-Some small bugs were eradicated
-Some smaller "cosmetic improvement"

-The length of the demo of course