Plot: Bang Bang Ball is an arcade game released by Banpresto in 1996. Skateboarding mice must throw colored balls against clusters of moving balls, while avoiding being hit by any of the balls. A thrown ball hitting one or more balls of the same colour causes them to disappear. Wikipedia
Plot: Cosmic Guerilla is a fixed shooter developed by Universal, the company that would later create Mr. Do!, and released in arcades in 1979. A ZX Spectrum port was published by Crystal Computing in 1983. Wikipedia
Plot: Chimera Beast is an unreleased coin-operated arcade video game developed by C.P. Brain and planned to be released by Jaleco in 1993. It is a scrolling shooter with primarily horizontal movement. Wikipedia