What a dire game. It really lacks a jump button, and a “jump to lower platform” ability too.
But, I persevered with it, despite it being less than one tenth as good as I recall it being from the arcades when I was younger, and made it to the end, destroyed the device there (I have no idea what it was) and then killed some bloke who looked a bit like Olaf from Advance Wars, who seemed to be the end of game boss. Even though he didn’t shoot at me or anything. The End! Never to be played again…