Yeah, that level will be fine. It's more about spacing. I didn't use bolt paper but I hear that helps A LOT. Applies electrical power to your weapon, which is Rom's weakness. I think you may have some in your inventory at that point.
At any rate, just run in, hit Rom a couple times, and roll out. Don't attack the minions, but constantly zigzag and roll in and out to avoid them.
When Rom rolls on his back, he's doing his energy attack where energy comes out of the ground. Hug him tight and it'll miss you.
When he flops up, he's going to rain down meteors. If you lock onto Rom, you can keep dodging left or right to avoid all of the meteors (or at least most of them).
