Fun start!  The music worked well and was true to the 8-bit spirit!  Only issue for me was that I found it really challenging to shoot at the zombie's while also trying to run away, but I'm sure with some practice I'd get the knack of it!

Love the sound design! Just want to give you a heads up that your viewport is quite small on browser, which makes it a bit challenging to play. Per the jam rules, you're allowed to scale it up as long as the actual game obeys the pixel dimension constraint.

It's very difficult to aim right, making the game very hard to play. Maybe player and enemies should move on a grid instead of moving freely. Another solution to try is to make the player move by holding a direction, but just make it aim in a direction without moving if a direction input is pressed and released instantly.

Also, please set a window size of x3 or x4 by default next time!

That was a very fun game! The weapon upgrades were great and the game was quite thrilling!

Very fun little game, love the purchasing new weapons, each weapon feels unique and a big step up every time you spend the money.