I think my biggest suggestion for future videos would be to be more conscious of the music while editing the clips together such as the trying to match hits with notable notes in the music. You kind of had such a moment in the MetaMatrix video with the Lucario combo on Ike starting around 3:12. If that started a little earlier so that aerial force palm started up (maybe a little beforehand) with that musical bit that starts near the aFP animation, that would have been cooler. Since you do not have the sound effects, I believe you need the music to fill that role and substitute as the sound effects to a notable extent. Some successful moments in the MetaMorphosis video are the Lucario Aura Bomb around 0:50 and the end of the Mewtwo combo around 3:00. In the Mewtwo combo, I like how the dair, the teleport, and grabbing the ledge match with musical cues. Also, it might be beneficial to edit the music to reduce the really quiet moments of the song or find combos that match those moments such maybe the Mr. Game & Watch dash attack combo or maybe a combo that has a lot of tech skill build up to it.
Try to let the combos finish before transitioning to the next shot, such as the Wolf dair at 3:10 in the MetaMatrix video and the Lucario Aura Bomb at around 5:20 in the MetaMorphosis. Also, I think there is something to seeing the player getting back to stage after going far offstage to finish a combo, but that is not as important as seeing a conclusion to a combo.
Also, in the MetaMorphosis combo video, it is really odd that it starts off with a couple of Captain Falcon graphics that is immediately followed by Captain Falcon being comboed by Meta Knight. I think it might have been better to start off with Captain Falcon comboing someone else.