Not really. Depends on how frequently the damage is dealt in intervals - you can, of course, program it such that everytime an enemy stands on the goop, it takes damage, alternatively you could make the hitboxes appear and disappear in intervals such as a fifth of a second, or half a second, and dish out damage accordingly.

@Oatmonster:
It's creative, but I'm gonna have to say no unless monsters can figure out a way to walk out of the blast radius after getting hit, otherwise all you need to do is to stack bombs and anything you lure in dies in seconds.