to rival the supernova, eden should have a demotruck-like weapon. you put the bomb in a cargotruck or a convec, and when it selfdestructs or is destroyed, it explodes in a fashion weaker than a supernova, but leaves a 5 square radius of radioactive ground that damages vehicles for a short time (like on Red Alert 2).
to rival the stickfoam, an improved laser, that over heats the movement computer only, but the turret must always be facing the target to heat it, or the IR wave go away and it cools down. (against buildings, it overheats the life support or ventalation system, but it still must face the target then too) \
or a gun that sends signals to a computer telling it to work so hard, it hurts itself. weapons would be stronger, but they would lose health quite quickly