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Heavy Nova (ヘビーノバ) is a 1991 action game for the X68000 by Micronet. It was ported to the Sega Mega-CD as one of the system's two launch titles (the other being Wolf Team's Sol-Feace); the Mega-CD port was not released outside Japan. Micronet subsequently ported it to the Sega Mega Drive for an American release in 1992.
A European Mega Drive release was planned by UbisoftMore... but it did not materialise. However, the American version was available for rent in Sweden.
You play as a giant mech beating up other mechs of various sizes. punches and kicks. rockets up for as long as the button is held; you will eventually come back down.
All versions of the game were universally panned for the clumsy controls, terrible hit detection, uninspired level design and terrible sprites' animations. The Mega Drive version, however, was criticized for the same reasons plus the appalling music.
Mega Drive version
Programming: Shaka, Dampei, Wns, Foma, Azy Mk II, Ikeda