This is Anti-Viral Protocol, a side-scroller platformer but with guns. In this game the player is tasked to shootdown viruses across levels to defeat the boss and obtain the Vaccine to destroy all the remaining viruses around the world.
Enable snaps on Kubuntu and install anti-viral-protocol
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.