Oozes also tend to be easy to hit. What you hit them with tends to make a huge difference in what happens, but hitting and even getting crits on them at low levels shouldn't be too difficult.
Try hitting them with something and if something bad happens, don't hit them with that again. I usually try to hit oozes with nearby goblins. Those pesky critters are always crawling about. And they make this satisfying sizzling sound as they hit most oozes.