Did you ever consider offering some UI components beyond those that are included in the very first pack of this series
Viewing post in Tiny Rangers : Peak Assets comments
It would be really amazing to have a set of pannels, buttons and sliders. Maybe even a circular progress/health bar.
In addition to the above, it would also be cool if you could consider expanding the icons for upgrades like reload time increases. I could see things like damage increases and generic stuff like luck.