Another PlayStation 1 game that was forgotten, Gungage (NOT Gungrave) is a rare release that came to Europe but not the US. The third-person shooter is built around replayability, which was a double-edged sword.
As neither the unlock system nor the light platforming was fantastic, the overall mediocre game failed to wow people on style points alone. For director Hideo Ueda, previously in charge of Sparkster on SNES, this pretty much spelled the end of their career in the cutthroat Konami culture.
FWIW, Gungage was far from the last thing Ueda ever did within Konami—most of their known contributions from then on were strictly technical/support roles, but they were one of the leads on Neo Contra, which one might want to put forth as a mea culpa for Gungage. Publicly, their last known activity within Konami was noted in 2012... beyond then, there's been no indication as to what they might've been up to or if they're even still there, and the frustrating thing is that a lot of 573 vets are still there, wasting away doing god knows what.
Even if Ueda does nothing ever again, they've contributed a respectable number of quality action games: the aforementioned SNES Sparkster and Neo Contra, but also Akumajou Dracula X68000 (Castlevania Chronicles) and Axelay, before they became busy porting all of Konami's arcade STG to home consoles.