Good start for your first vid. Here's some feedback:
Try to record in a higher resolution, 720p at least (if possible).
Avoid replays that are just autoattacking (nomad for instance).
Up the camera angle on every replay, having a low angle makes it too difficult to tell what's going on (the tremble play was completely un-watchable).
Avoid unnecessary slow-mo replays on something already seen, unless it really really deserves it (take out ones like the kill on witch slayer).
With some improvements, your second video could be very well done.