Legitimately some of the most fun I've had this jam! The audio, graphics and gameplay all come together nicely, and the game loop works quite well. A few things I did notice in no particular order:
- I couldn't tell if the between round upgrades are reset each time or not. It kind of seems like they are?
- The HTML5 version at least reliably starts to lag badly when the tan guys start spawning. Disabling enemy to enemy collisions with a collision layer/mask would probably help with the sheer number of colliders
- Related to the previous point, sometimes the small guys would spawn on top of the big guys where bullets can't reach them
- I didn't see an xp bar, which would have been nice and added to the progression feeling
I also appreciate that the truck-kun joke made it into the final version :D
Awesome job and excited to see what you do next time!