This is a really well made game, especially for one person solo! I do really like the idea that each turn the creature that can attack in the active spot swaps, and being able to pay energy to swap feels like a great way to combat it while giving up playing more cards. I feel like I would have to play much more of it to get really specific on the game design aspects of the card game itself, but I can speak to the rest of it.
I've seen plenty of jams where someone has made a card game but focused just on making the complex game work that they forget things like sound effects to make it fun past the system level. It's clear here you took the time to really make sure the game has elements that make it fun! I very much appreciate the in game tutorial. Every action seems to be paired with sound and visual effects. You have great music and I wasn't expecting a phase change with a new track. The background visuals have good movement but they're not distracting. The art on the cards are fantastic as well!
Excellent job, I can't wait to see more from you!