Hey, I played your game and wanted to give you a feedback:
First of all, it is really funny and I played the first 2 worlds (forest + desert) and the lava chamber thing.
The movement is quite clunky and there are some bugs.
Primary fire is the biggest problem here, because you can only shoot while standing completely still. Also, when you shoot while jumping up (not while falling), the bullet will spawn on top of the character.
The knife attack has no cooldown, so you can basically 1 shot every enemy when standing near it and spamming "m".
The soundeffects of knife and shoot will always play when you press the button, although the animation is not playing.
You should focus on fixing all the animations and make the movement in general more fluent before adding new things!