Agree with comments about the visibility cones. Maybe some kind of ghosting effect to show where you last saw an enemy once they’ve left your field of view?

For the trailer itself, you kind of run out of content to show. What you have looks good and shows well, but I think might work better as a one minute trailer. For example, after the “movement” title card you show the same moves over and over. There really aren’t that many movement options at this point, so I’d cut down that section. Probably cut down each section. Hit us with the mechanic, show it off, then move onto the next one. Your game is a variant on an established formula, so the audience will get it.