A GM trying to deliberatly screw over the player? Isn't that the regular tabletop experience?
More seriously, I can see the concept, but the game has some flaws.
- First, the pace: it takes a bit too long to complete a wave. It can be fixed either by speeding up the hero, or making the board smaller.
- Then, the multiplers on the cards do not give much information about what they truly mean in terms of battle. I just picked up the lowest numbers until it was enough to kill our poor hero.
- The music being a simple riff loop gets tiring pretty fast. You could make the card selection screen's music different to break it for instance.
- Finally, and I know it's a bit specific: being colourblind, I had no idea how much health anything had left. The color of the health bar is too close to the background one for me, better contrast is advised with important UI elements.
But! Even if it has these problems, I still liked the game idea, it has some potential and merit (I wouldn't be giving that much feedback otherwise ^^).
So good job, not bad at all for a jam! =)