I like how you comprimed the whole "campaign" to one map. It is fun to discover new tower types every second wave, they felt unique which is great.
Dragon narrator is cool and he helped me to be dragged (no pun intended) in the story while providing useful info about unlocked stuff.
I've found both music and art very pleasing.
For the resources - sometimes less is more. In this case I felt pretty overwhelmed by the amount of different resources. There was also little feedback on what I have earned, so at the end I just didn't care, because usually I have had enough to build what I wanted.
The difficulty is on the easy side, which is fine for the game jam, but for the full game I would personally preffer more challange.
Enemies that were shooting at me were a little annoying as the only tower in range of them was catapult and as they stayed in the back, they were targeted as last, so meanwhile they destroyed a lot of my towers and I was shouting on my catapults: "Just shoot those guys first!".
Overall very good game. I had fun playing it.