I think you have the foundation of a really cool game here, there's a few minor things that detract from the experience in my opinion: The countdown timer needs to follow the player so you know how much time you have left. It would also be nice to have your total amount next to what you are currently holding so you know how much to get to unlock a certain upgrade. There's not really any reason to explore the whole world since all the resources respawn every time you come out of the monster. I liked the art style and I think the controls and camera and mechanics were all really solid and well polished. Great job!