I liked the bamboo concept, and I’ve also had to upload games without audio before, so been there, done that. The control setup felt a bit awkward for me. Maybe allow up/W to also be jump, so the player’s right hand can be used just for pressing L and K.
The movement is a bit stiff, and it was hard to hit the zombies, but for a first jam game, well done. Good luck on the rest of your game jam journey!