The sheer variety of enemies, buffs, debuffs, and upgrades, especially considering the time constraint, is impressive.
The basics of battle were relatively intuitive because I was used to STS but everything else was confusing at first. For example, I took a ton of damage because I didn't understand that the firewall buff was actually thorns. A help menu and/or visual or auditory damage feedback would've been nice.
Additionally, the post-battle decisions were even more confusing. The card upgrades were relatively well explained and I think it's fine to let the player just try stuff out and learn, especially because there was a description as to what upgrading a card with a certain element would do. But then there were two cards and I could only choose one of them and I had no idea what that meant. Was that still part of the upgrade process? Then there were lots of symbols and it kinda resembled the upgrade process from before so I thought maybe that too was part of the card upgrade and suddenly the next combat starts and for several encounters I had no idea that I was choosing the path to the next enemy.
The first miniboss felt weirdly luck-based. To reference STS again, if I see an enemy with thorns I know it's my fault or my deck is not strong enough if I let them get to 15 thorns. The miniboss was alone and had so much health that once I got unlucky, she got to 15 thorns and I just had to wait for maybe 10 turns, use only use block and wait for the buff to dissipate.
Other than that, the game had nice visuals and gameplay and for your first game jam submission it's really good.