You're fine, nothing you described is out of the ordinary. The foam and "slimy stuff" is krausen, the amount of which depends on a wide variety of factors. You're understandably nervous about what I assume is your first brew, but try to relax and trust the yeast to do their job: they are quite good at it.
I like to ferment ales in the mid-sixties, but 72 is not terribly high. I've made wonderful beers at similar temps.