Here are some thoughts about your game:

• It is hard to know what each card does. I took a while to figure it out. Maybe have some effects. Like maybe cover the screen in hearts while healing? This is something you’ll have to playtest.
• I wish there was more of a sense of progression. Why are we fighting these animals?
• There is no real strategy for the player to use. I just redraw the cards until I can use heal enough times. And then attack. There are no interesting decisions for the player.

I think that this idea need quite some more work to function properly. Try making this game on paper, and let a friend play it. This will make it faster for you to find an idea that works before starting to code.

But good work for a first game jam game :)