There are actually a LOT of reactions. You just don't see them cause you can get all 115 without some of them. I tired brute forcing the thing, and there are many reactions and funny quotes.
For those with problems with the Bowl:
You need to kill the creeper as soon as you can. That means gunners not mortar, and minimum collectors.
First priority is to start getting Machine Guns close enough to shoot ASAP. I just build collectors straight up, then Machine Guns before spreading sideways to curb the Creep overflowing into the bowl. Mortars later, cause they take too long to build.
Mine still flooded a bit, but the gunners on the ridge cut of their supply, and I get 1 gunner per side to clean up.
Build collectors all around, mortar to replace gunners, drones to bomb the source and slowly push forward.
So much for trusting the 3.00 timer. I set it up so that I can change my castellan before I finish an upgrade, if I can log in at 3.00. So much for that.