Now, y'all should "tank" SP for ruining what could be one helluva tank.
Basically, once the part count got above 450, the cannon would stop working. Bombs would hit the ground but refused to explode. All they did was sink into the ground. Jundroo, please fix.
The E 25 (also nicknamed by some of us as the Devil or COCKroach, although the latter is reserved for the T-54) is a tier 7 absolutely balanced tank destroyer that only sees tier 5-8 tanks. It's got a 75 mm that shoots ungodly fast (with a good crew you get about 3 sec reload) which has crappy standard ammo pen but good-ish gold pen.
In real life, the E 25 (E stands for Entwicklung = Development) was one of the tanks that were part of the Standardpanzerprogramm. The E 25 was designed as a light tank destroyer made especially for reconnaissance (much like its smaller cousin, the E 10). It would've likely replaced the JgPz IV and the Hetzer.
*Uniscrub guide to the Cockroach*
Pitch and Roll make it move faster than light.
VTOL+Trim are used to move its filthy head around. (aka the gun / AG8)
AG1 activates the spare head. It also comes with a peashooter against enemy bugs (use VTOL+Trim for it).
AG3 for when you're too dark so you gotta light yourself up. (activates the lights)