Well done!
I like how you can move the mouse to swing the sword. The ability to upgrade the sword was a fun surprise as well.
I was a bit confused on how the upgrades worked, so I just dropped a bunch of random ones into the slots and my sword quickly became OP (in a good way).
I think it would be cool to have some way to defend against the enemies, especially the ranged attacks from the archer. Just a suggestion as a possible feature to add in the future.
Overall, great work!