It's a very good idea. The only problem is that it's overproduced.
If the idea is to demo the game of Warmachine to your audience, you want to avoid adding things into your video that would distract people from simply hearing and learning the rules.
Right now you've got loud music, a distracting way to reading the script in time with the music, film grain, a blank white table that had no depth cues.
Just having the video as you normally have it, in the game store where you usually have your battle report videos, where you play with a painted battle boxes, no music, and just your commentary between the two players.
For a demo, you'll want to break down everything that's happening, including saying what you're doing, even showing some of the measurements you do and speaking it out loud since it's hard to see the ruler.
Try and take a look at the videos that Arcane Legions did. Those are overproduced in a different way, mainly with costumes and props for the host, but the video itself is clean, precise, and quickly tells the information.
Also realize that people can understand the spoken word pretty quickly, so don't be afraid to recite the script at a quick pace even if you're explaining things, just so long as it's at a normal conversational pace. Speaking slower doesn't help and might make some people impatient or feel like they're being talked down to.
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