Note that this feedback is based on the build(s) available at the end of the jam.
Regarding what was present at the end of the jam, you may want to look at bending your character's arms and legs a little more. Godot also has the ability to blend animation states using the AnimationTreePlayer node, which could help you make the transitions between changing direction changing and actions less jarring.
Some barrier to prevent falling out of the level, or a maximum distance the player can fall before they die/their position is reset would be another good thing to look into.
It seems like you might have overextended your reach with this one a little, but I'm glad to see that you've continued development. Adding enemies and making the game wave based seems like a good direction to go in.
Thanks for submitting and good luck with the project! :D