This is really cool! Super fun gameplay and I can really see your vision of this being similar to Vampire Survivors but with an emphasis on defensive gameplay.
I loved that all the upgrades/items made a meaningful impact on gameplay which gave me things to think about and strategic decisions to make.
With a bit more polish time, things like audio can help add some more feedback but understandable that this wasn't prioritized as we only had a week!
This is a strong showcase of your game design skills/knowledge.
This is a really great entry and a fun game, well done! :D