Fun game. Really liked the creative creature shape design you used. Gave each of different types of unit some character. Lighting effect looked great, as did the actual cards themselves.
For improvements, I'd suggest adding some way to counter clumps of ranged enemies. I found that if one side could get 3 ranged enemies up and running, it was game over for the other side. Maybe add an AOE creature/ability to counter this.
Overall, great submission. Well done!