I just took some time to play through the tutorial and try a few games on my own. This is such a great demo! There is an impressive amount of depth and complexity to the gameplay and I think I could spend quite a lot of time investigating the different builds and move combinations. The sun spirit is my favorite daimon so far, without it I was getting crushed!
I did get a little stuck on the deck building screen for a bit because I didn't understand that I was supposed to press space bar to advance after having selected the cards. So for anyone else who may come across this when playing the game try using the keyboard arrow keys, enter and spacebar to play the game.
Overall, this is looking awesome so far and I'll be very interested to see what you do as you continue development! Great work!