Well done. I've had to give many presentations over the years and at the risk of teaching you to suck eggs, would offer the following tips:
a. Go through the vid of your presentation and make a note of where you repeat yourself i.e. use the same words again at a relatively short time after their first appearance. Consider a rephrasing, unless of course you are making a point which is almost like a slogan and you want them to remember it.
b. As you repeat your material (and you can never rehearse enough) longer and longer chunks will stay in your memory just like an actor learning his lines. This of course frees you up to deliver it in an ever more natural way. The good news is that you are starting with a very natural style of delivery, so you can only go from good to excellent.
c. As more and more becomes committed to memory you will have less use for your script. Replace it with cards (the sort that are about half A5 in size and used to be used in index systems) and just put the headline words along with key phrases or sentences just to get you going in case of a temporary blank. Hole punch the top left corner of all the cards and hold them together with either an india tag or an elastic band. That way if you drop them they stay in order. This is a particularly useful thing to do whenever a script is relatively new to you. As time goes by, even the cards will become redundant.
d. If the length of the presentation is a factor, time yourself and when giving the presentation, take your watch off and lay it on the lectern so you can pace yourself. Obviously no need for that if there is a wall clock conveniently placed in the room.
e. Some people get nervous when giving presentations and find it difficult to make eye contact with the audience. Solution: pick two or three people on the third to fifth rows and look at them in the middle of their foreheads. They and the rest of the audience will think you are making eye contact.
I found your talk generally inspirational after watching it I got off may backside and went out for a ride which I had been umming and ahhing about (and I only need to lose about a stone!)