It's crazy that you made a deck builder this good in just a month. The art is incredible, the rotation mechanic is super interesting, and there's solid card variety. I can tell you really put a lot of thought and effort into all of it.
The game seems pretty balanced, though there are some stand out cards. For example, it's pretty easy to cheese bosses using Azriel. I managed a turn 3 win on the final boss by rushing down the core and just playing him across from the boss.
Also, perhaps I skimmed through the boss tutorial too quick, but I'm still not sure what determines a boss' stats lol. I do like really the mechanic of your boss coming out after your core is destroyed, the last ditch effort vibe is just straight up cool.
Overall it's an awesome game, I can see it going places for sure :)