Oops! I see now that the instructions mentioned the weapon swap controls and everything. I just got too lost in the sauce.
On UI, it can be a huge time suck, so glad you were able to get something in to move development along. On the last day of the jam, I planned to churn out the UI, SFX, and spice up the starting and ending screens a bit. UI work ended up just ballooning up to fill that entire time frame. In exchange, I feel like I did finally learn enough about UI in my engine of choice to make it come together much quicker in the future.