I achieved the ultimate boombox!
To be honest I was never a fan of Vampire Survivors, but thankfully this one was short and sweet so it was good.
On a technical issue I do agree with other comments saying the rapid upgrades do make the game a bit too easy, but as I said before I don't mind playing a short Vampire Survivors clone. And with so many entries this year I appreciate short ones just generally.
Also I agree with comments saying some background music would be good.
Overall though, great work!