Two lines per bullet point?
When learning about design / presentation methods we were told to have a single line per point.
Also: not twenty different font sizes, weights, styles,.. (I'm looking at you, PowerPoint!). I think it makes sense.
Ten slides for 30 minutes is not much, but as I understand I would probably give the same presentation in 15 minutes - if the audience has the background knowledge. Hell, I could do most stuff on a whiteboard which has the advantage that things are slowly developed into some mind-mapping-mystery. It also avoids overloading the audience with text. Note how it says "audience", meaning the people who listen, not read the novels you try to cram onto each slide!
Sure, we now get some public outcry over the "dress code", butto me it makes sense: don't look like something the cat dragged in, you are not in academia[*], don't expose yourself, a business environment is not the place for that - and that is true as well if you are one of my students in a lecture or something[**], if you want to wear _that_ you should go to the beach!
[*] I know what I am talking about, dresscode for geoscientists is cargo pants and t-shirt or a short sleeved hiking shirt... maths and physics are worse, some high profile scientists really look like hobos. Nothing wrong with that, but outside academia you might want to look neater.
[**] no, I do not want you to turn up in a suit or dress or whatever, but I once had a gal in one of my tutorials where you could only wonder whether everything would all of a sudden fall out of the skimpy little outfit, and some guys looked like they just came out of the gym, sleeveless muscle shirts and sweat pants included.