I'm going to join the chorus of people praising the art - did you really make all the trees and ground tiles and enemy animations within the jam? That's ridiculously impressive!
The long cooldown to wait for the warrior to be available is kind of painful, especially since the default character is so slow and has no abilities. Maybe the main character could be fast and agile, so you run around dodging enemies until the slower but powerful warrior becomes available to wreck everything?
Aside from that, game feel could definitely use more work. The animations and visuals are great, but I would've loved some sound effects and visual feedback for getting hit or landing hits. Some music would also be nice to make it feel a touch less barren. It wouldn't take much to make this great-looking game feel great.
Great work on this entry! I had fun exploring it.