Not a bad start, played for probably 20 minutes before i frankly got a little bored. I'll be keeping an eye on this though, i have a soft spot for card games.
A few things, would like more HUD, a way to see my energy while choosing a card would help a ton, and some way to know what cards are what, that's weird to say but i had one card i never got to use because i needed to use 2 X cards, but had absolutely no idea what that meant. (Started with a V I think)