Fun and polished. Stat upgrades reminded me of TBOI, so I went all in for shot speed (reload) and that paid off :D
I wish there could be music and/or sounds, other than that - great entry, well done!
Thanks for playing! A version with sounds has since been uploaded. I originally left it till the end, cause sounds implementation can be a bit hard, but with the restrictions, it was surprisingly easy.
Just tried one with sounds, pretty neat!