Minimalist Spelunky + Random Guns That Also Mine is just a winning combination for me what can I say?
Some of the guns don't feel very different - though they all feel good - and the final boss is a touch too hard. But I like the minimalist art (I especially love the menu!) and I think the game is pretty fun.
However, I think it's worth calling out that you technically shouldn't be using any of the royalty free audio you are using. I think it's a rule that possibly makes the jam unnecessarily harder, but it is the rule this year.