The new forums will be named Coin Return (based on the most recent vote)! You can check on the status and timeline of the transition to the new forums here.
The Guiding Principles and New Rules document is now in effect.
...Which I own, but I don't know where it is or what it's called.
It was probably early 90's, maybe '91 or '92. Isometric view. You controlled a mech with various weapons that had limited ammo, and the goal of each level was to roam around and destroy all of the enemies, and then fight a boss. You were timed. The first level was a city, I think the second was an elevator, and one of them was a train with tons and tons of turrets. Another level was set in ruins, and the boss was 3 (I think?) smaller mechs that created a ring around you and flew really fast.
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Final Zone?
Not everything fits, but it's the only isometric mech shooter on the Genesis that I can remember.