It will be ok until like 14 where you will struggle with damage until 18, where it will pick back up until cap, where it will drop off, but theoretically not terribly.
Acid blast (max/emp) plus black dragon breath from dragonborn racial will carry you to 12 when you get the 2nd acid blast as an sla. It should be fine with those 3 until 14/15 when damage starts dropping off due to low mcl 10 and really increased monster hp. When you get acid well (max/emp) at 18 it'll be fine again.
Then epics you have acid well and breath epic strike and black dragon bolt for single targets which will be fine to 24, then you get master of earth(?) to add 10 mcl to acid blast (dunno if the boost to melfs acid arrow is significant for single target since the changes to its base damage). This will continue to be fine until 26 when you get to double breath epic strike damage. There's also shard storm primal spell from primal, though I've never used it. It looks like it's more of a single target spell to open with?
It'll looks like it'll honestly be perfectly fine up to legendary r4 (personally I dont see the point beyond r1 anyway unless you need rxp). Your rotation is only 4 spells, well, blast, blast, breath (theoretically because the first 3 are range so you can cast them while running up to them, whence you can then breath) but blast has a lower cooldown being a level 3 spell, so you can probably weave it in after breath and before well again. Its just not as much damage because you have to rely on feat-boosted level 3 spells. Double ruin and black dragon bolt for single targets should be perfectly serviceable.
Try it and let us know how it goes. I've always wanted to do it because I really like acid blast gfx as a spell!
