No revenue estimate for PSN — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $2.5K — a different platform, not this one.

Guardian Force - Saturn Tribute

Attack in 360 degrees! Guardian Force, the timeless shooting game featuring cyber tanks, is finally back! The Guardians, a secret society wielding the power of the Force, have readied their tanks and intend on crushing the aspirations of the Hammerbolt Empire! This is an auto-scrolling, multidirectional shooting game released by SUCCESS in 1998. This masterpiece of the past is given new life using the specially-developed \"Zebra Engine.\" The new features included such as game rewind, slow mode, and quick save greatly improve ease of play. Online rankings have also been added!