The low level center area has a chasm large enough that players can't normally jump inbetween the two halves, but it's still possible to shoot across or toss bombs to either half! I tend to forget about this sometimes, which leads to me getting sniped by a Charger from the other half. But other players tend to forget about this too, which is great because I can often snipe other players from my half with the Jet Squelcher or an Inkzooka. And if I see that wall on the other half is getting breached, I can sometimes throw a Suction Bomb over or shoot in that direction with a Jet Squelcher to harass players that are trying to climb up.
With that said, I think it's really important to think about the center as a whole thing instead of two areas! One should pay attention to what's happening on both halves and remember to give support fire when possible. Choosing which half to go to at the start is also pretty important.
a) If you're going to the right half, you should play more defensively and lock down that area. Definitely don't overextend. The right half has 2 walls which can allow enemies to breach your upper ground and get behind allies on the left half. Please don't let that happen. If your weapon has enough reach, you can also attack to the only wall on the left half that goes to your upper ground. That's 3 routes to your upper ground that you can cover! From the enemy's direction to your right half, there's only 1 wall; their other entrance to your right half is a cliff that can leave them stranded, so take advantage of that! Basically if you're on the right half, you have to cover a majority of the routes into your upper ground, and you also only have 1 way forward so enemies can predict where you're coming from.
b) If you're going to the left half, then you either want to breach asap or at least ink your wall for escaping. Staying in the middle while enemies rain down on you from their upper ground is bad bad bad. And when moving towards the enemy base, you have two walls you can climb which leads to the enemies' upper ground. You can fire to one wall while on your right half that leads to your upper ground, but the other wall is too far for you to reach (the E-Liter 3K might be able to shoot that far, but I wouldn't count on that). Basically if you're on the left half, it's much harder for you to prevent enemies from breaching and you also have fewer escape routes, but you have more options for rushing if the enemy's attention is divided enough.
The walls in the center area are very much the key parts of this map imo. Maintaining control of the walls controls a lot of mobility and can give you ambush options, both by popping up on enemies near the wall and to also get around to the other half and attack the enemy from behind.