Cool deck building game! I love how you've polished your UI, the feedback every actions provides is satisfying. The action cooldown reminded me of my old days of World of Warcraft. You try to look at applying a color palette for your game that would greatly increase the visual appeal of it. There were also a couple of texture that you could improve (I'm thinking especially at the closing button).
But overall, this is an impressive undertaking, thanks for making that game!