Cheers for playing!
120mm cannon feels a little on the weaker side of things currently.
That's fair. I'm not completely happy with it either, and I can see how compared to the other more rapid-fire weapons it feels a bit underwhelming at times. Maybe I'll increase the damage and penetration to compensate for it.
Minor nitpick on the worldbuilding: a 5 petawatt laser drills through something like 20 kilometers of graphite a second (I think). I know it's "ultra high energy" but by the prophets it doesn't "violently ignite" or "sear a hole", it turns whatever it's looking at into a rapidly expanding cloud of ionized plasma, regardless of whether or not it's fleshy. I'm pretty sure a weapon like that would make armor irrelevant.
Haha, I like that. I'll see about adding some more visual effects to imply the objects being turned into plasma. The concept of an anti-armor laser is really appealing to me, and I'll eventually have some enemies equipped with them too.