Once you get "Parting Gift" (grey, while in effect any unit killed deals 1 point of damage to its enemy's portal) you can pretty much build an unbeatable deck only made out of gold mines, two or three crystal mines, parting gift and cheap units to send against the enemy to be killed. You can also put in instant soul givers and as many "Siege Engines" (grey, deals 10 points of damage to enemy portal) as you have/want. Game pretty much becomes trivial that way.
The pixel art was quite nice, nice contrasts between the darkness and the vibrant colours of the light sources. I also enjoyed the no-weapons-concept. I have to admit that at around lvl 3 I kinda got bored, continued through anyways though. The ending(s) seemed unsatisfactory after the story tidbits from the stone tablets aswell, some kind of climax would've been nice.
Well, yes, it's not a game per se, but rather an interactive story. Still has a place on this site, I think. The artwork reminds me of a kids book, as does the moral. Sure, could've made it a movie, but I feel controlling the character adds emersiveness to the story. Gave it 5 stars... just cause I'm a sucker for this type of thing ;)