Thanks for playing and the feedback.
The varied resources was due to the theme and our intent do include more of a crafting element, that never worked out. We had lots of ideas for what we wanted, but were not happy with attempts to implement them, so fell back to basic tower defense, but with a lot of resources that ended up being mostly flavor text and setting.
If we did a full game we would increase the difficulty, and add difficulty settings. Even for a jam game, this was easier than we intended. One change we'd make is that we originally had paths at the top and bottom where later waves would come from, and we'd add those back. We cut them for the jam to simplify for those who don't normally play TD games.
Right now the towers all target the enemies closest to the end. If we built this out we'd allow you to set the targeting per tower, so you could have some catapults aiming for those hiding in the back, or perhaps by some other stat. It would mainly just be a UI change to add it. Given another day to work on this we probably would have included it.