A really nice vampire survivor-like! I really love your music and your art (the key art is especially good!). The feeling is good, however I had troubles playing since I have an azerty keyboard, I think you could have use the arrow keys as an alternative to wasd controls to make Kitsune Island a little more accessible! (That's not mandatory, but it will always be appreciated!)
I think the prerequisite is present in your game since you start with no money and upgrade your weapon while playing? I think you could have add a different weapon sprite according to the upgrade (even another color of the default sprite could do). Maybe the character could have start with their bare hands to fight and unlock weapons next?
Those are suggestions only, I think your entry is still pretty good, you did a nice job!