Well, this is embarrassing, I have no idea how that one slipped through. You're right its just a leftover from testing. Thank you for letting me know. I guess i will upload a fixed version but leave the original up in the spirit of the jam.
But even with that, i think damage and attack speed ended up being a bigger deal than weapon level. I didn't really test the game past world 4, and already there the amount of spawns get pretty crazy. Making balanced random waves ended up being harder than i imagined.
Thank you for trying it out!