Max Massacre is now available on Steam.
It was originally released on Itch in 2016, but has been absent from Steam until now.

Release notes, including what's changed in the new build, can be found here: https://store.steampowered.com/news/app/2255950/view/3664289584762843192

The update is also available on Itch.io. Release notes here: https://zetsuboushita.itch.io/max-massacre/devlog/551107/version-200

The update has also been submitted to Google Play (pending review) and will be on other stores soon.