If you were to improve your game, I think you should make the automatic pause more clear as to what its purpose is and what you're supposed to do in there because I didn't really fully understand it. And you should make the smaller dices roll just like the bigger dice do.
I feel like you should add some more effects like some screen shake and better sound effects as I just didn't really feel like the sound effects fit the environment and I just didn't think they were very good. I also didn't really think the art looks really good but I think you couldn't really find what you wanted given that you said that you used pre-existing art.
Anyway, I can see that you put a lot of effort into the game and code so good job on that, especially in 48 hours.