Most of Nova's offense will have very little effect on Apocalypse to begin with. Bullcharging into Apocalypse isn't exactly Nova's best option either. He'd be better off keeping his distance. Apocalypse is stronger, more durable (particularly his Celestial Armor), and can adapt his physical makeup to make himself even less susceptible to what Nova attempts, and he can also erect shielding and teleport. Apocalypse also has energy attacks as well. And since this is a no PIS/CIS scenario, that means things like life force draining and body swapping are in play for Apocalypse (though not necessary for victory). Nova doesn't have Jarnbjorn at his disposal to bypass Apocalypse's Celestial armor durability. IMO, that's a big factor.