Fun and cute game! After my 3rd death I think I got a solid grasp on what is going on lol. I think the game was pretty good so far and everything was pretty intuitive.
The only thing I would say is to make it more obvious on what is chosen during the upgrade section. I noticed that the grey out button means something is chosen, but maybe adding a bit more visual feedback on that would be nice. Maybe making the card tween larger? I did not notice or understand if I gotten something at the store on my first play through is why I mention this.
Other than that, amazing work!