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That's cool if you made this with rust!
The use of low res was good, however having the upgrades be less frequent and more impactful would have elevated the gameplay.
Also, if you need low res sound effects real quick use Chiptone or jsfxr. It's mostly what I use!

Totally. The source code is available on GitHub as well :)

Thx for the suggestion on gameplay, it's not my strongest skill, so I'm always looking to improve. And about jsfxr/bxfr, I actually had generated a few fx with it but I forgot to submit to the jam the version with audios. Hehehehe, it happens!