I will give my pros and cons:
Pros:
- Visuals look nice, you have a consistent and pleasant art style and the animations look good
- Well thought out abilities, it gives a good bit of strategic thinking
- Self explanatory, nice that you don't need a tutorial or steep learning curve
- I like the map
Cons:
- I think there are some bugs, such as your remaining energy not displaying correctly when using cards
- I'm not sure how upgrades work, I upgraded a few cards but it didn't seem to do anything
Overall its pretty good, and feels polished.