He's basically the same as the Egg Mobile ZX from the final boss prototype WAD, but there are a few aesthetic changes to help fit the steampunk theme, as well as numerous gameplay changes:
*The first pinch attack was toned down in difficulty, with the turretfire being significantly slower and the rotary attack being a bit easier to dodge.
*The final pinch attack was modified so Eggman waits a short time after the thrown shield detonates to generate a new one, making it easier to damage him.
*If you fail to get close enough to make his shield weaken, he'll only ramp it up one power level instead of returning it to full power (with the exception of the vulnerable-at-the-end phase). For example, this means that being too far away to activate the third and final phase will return the boss to Phase 2 instead of Phase 1.
*Most importantly, the boss makes it very clear that being close to him is helpful to you. After he finishes attacking, you're immediately rewarded for being close enough with a flickering shield, a blaring alarm, and a generally panicked Eggman. This should help make first-time players understand what triggers him to drain his shield and what doesn't.
(NOTE: Because Steam Engine requires custom textures, this arena is not very fitting aesthetically. I would appreciate it if the designer of either Steam Engine Act 1 or 2 would give the arena a visual revamp once the appearance of Steam Engine in general is established. I would advise against recreating it from scratch, however, because of the complex interaction between the boss's SOC and the map's linedef executors.)
As you can see, he now fires giant missiles instead of giant energy orbs. Also, by complete coincidence, the timer on both screenshots reads 0:09.
Object Slots: 400-409
State Slots: 2000-2125
Sprite Slot: F025
Download:
http://www.sendspace.com/file/l5n6s1
