Really impressive for a game made in a month! The art is fantastic and once I started understanding how the game worked, it got a lot more fun! For games like these, having an interactive tutorial rather than a block of text is really beneficial. I felt quite overwhelmed and I feel like a lot of things were not explained at all, or not clearly enough. I understood the attacks, but what about health? I wasn't sure why or when cards would die or not. The different card types and synergies with them were cool, but again, way too much information at the very start.
The mechanic of L and R attacks, as well as the core attack was really well done. That along with the field spinning made for a fun and unique mechanic that is totally worth exploring further. I also found the fact that you can play your own bosses great as well. You seem very passionate about this project so I wish you lots of luck with it!