I love the art design, the card drawing mechanic is smooth and the positioning of all the cards spreading out evenly looks clean. Mouse hovering making a card enlarge gives that card a good focal point to focus on. 

The description mentions holding 8 cards, but it seems 7 is the max in this demo. Also, maybe adding a highlight border around the selected card might make it even more stand out and appear that it is targeted. This is also more of a specific accessibility issue, but the cards that mix red and green are hard to decipher at a quick glance for someone that is strongly red-green colour blind like me. 

Overall, cool demo, can't wait to see the gameplay get fleshed out.