Hi! I just finished testing your game. The idea is really cool, just the game itself needs a lot of polishing. I am aware that it is still an early version though. I believe it will become a fantastic game over time.
Demiurges was fun to play despite the large amount of small flaws. I will describe them to help you get rid of them.
For a start I'd like to say that the atmosphere was very special - gloomy, but awesome! I like a lot the world you created, projects of heroes, units and town. Making fragments of the map connecting to form a one bigger place is a nice idea too.
I'll talk about map graphics now. Gentle mist around the obstacles are really nice to look at, I watched it for a while when I spotted it, haha.
Unfortunately, many places (at least on the first map, where it's quite dark) blend with each other. I think the issue is a small variety of brightness in colors there. I would recommend you to follow this advice: you can take a screenshot and paste it into a drawing program (like Krita - it's free and I personally use it), then decrease saturation to make it all in the shades of grey. That way you will see much better which elements needs to be more separated.
The music is very unique, gives the game very gloomy mood. I assume it was your target - the world is doomed after all. In that case music works really good! The only things I would complain about is that it lacks a variety a bit and that there's no separate battle soundtrack.
When it comes to other sound effects, I loved them all.
Overall I like UI, but there are things I don't understand about it. For example, animation and style of the left upper UI is very nice, but I completely don't know what's it for.
I think it wouldn't hurt to add some background under UI, even transparent one. When we are in the town resources indicators are a bit harder to read.
On the other hand, the whole UI when it comes to cards was cool and understandable for me.
I would love to be able to recruit all the creatures in one place in the town and I would really like to read about them before recruiting (I didn't see that option in the recruitment menu).
This game desperately needs a tutorial, but I guess you already know that.
Boss was much easier than I thought, I think you could make it a bit more difficult.
I didn't see the option to run from battle, maybe I missed something?
One more thing: I think that drawing a card would work better after we close the window showing us the time left.
It was a fun game, the concept is really awesome, it "only" needs a lot of polishing.