For a game jam submission, the game's polished and delivers its gameplay well.
At first I was confused with the UI but immediately figured it out later on; considering the time limit, the menu system is finished and working fine.
Additionally in regards to the game's window, for some reason whenever it starts the displayed window overlaps the screen at the top left corner. This is fixed by changing the size of the window or using the fullscreen option so that it no longer overlaps and is displayed properly at the center of the screen.
Also, there's a cobra enemy that rapidly hits you with its attacks and I just encountered it in the 3rd day. Is the attack rate intentional? I only managed to defeat it 2 times, but then again, one's progress depends on how well they're managing their deck.
Overall, for a game jam submission, the entire game is playable. The game mechanics are executed properly and follows the limitation of the jam, and the visuals portrayed the theme very well.