Looks like you lack speed. Try to reforge your equipment for +4% movement speed. Since youre a summoner, your defense wont matter much. You will entirely rely on your abilities to dodge attacks as your minions will deal the most dps.
Pro Tip #3: The yellow radioactive battery inside the facility is what keeps all the power on which is why you should leave it for last. Besides turning off all the lights, it also locks the secure doors which will not be able to be openned through the terminal anymore (this same effect can be achieved by messing with the powerbox breakers) I should also mention that taking the battery will trigger an invisible eclipse mode. This means monsters will start spawning outside early and more often.
Another Pro Tip: When you enter a leaking steam area you can turn it off by turning the valve inside the gas. Valves outside of foggy areas dont do anything.
Superman depending on the variation would box against goku untill about super saiyan god but if it was ulitmate golden or supreme superman they might have a legendary battle
Pro tip: When the thumper (crawling speedy monster inside the building) is chasing you, you can jump up high on the railing of the catwalks and just start whacking it with a shovel or scrap weapon. Same goes for spiders. Also SCP-173 is in the game, watch out for *Coil-Heads*
Im the more softspoken one usually btw but you can see my mic turn on when im dead too to know who i am lol. I think the volume is fine but I was a little quiet sometimes.
tip I use to improve a bit go against a hard ai in practice or vs maybe 3v3 or 2v2 and if you want to up the game use a preset no ultimate or super or both and see how well you can go for 2 or 1 hour