I always thought ROB had a lot of similarities with Samus.
Anyways, 1:35, though cool, should have been faster so it would have been harder to escape.
Needs more bair in general.
Don't grab release right next to the edge of the stage!!! Throw him off and shoot lasers or grab the edge
Charge Gyro. Or shoot out uncharged gyro if he's not approaching, and grab it, and glidetoss for awesome.
Usmash and Uair have really not so great hitboxes HORIZONTALLY. You're better off with ftilt as you were doing a lot. I'm referring to the spotdodge - usmash - spotdodge - usmash, both usmashes whiffing because he was to the right of you. He definitely could have punished this
The uair to dsmash was cute but blah, I'd rather see a bair there.
Up B ledge snaps. If you're close to the edge, don't use your second jump like at 2:50 and 4:05. This is really important to avoid either stage spikes or general punishing crap. Kinda use it like Samus Zair/Up b etc. ROB's ledge game is no Samus ledge game but you really could use it better ;P
Also, recovering high is much safer than going for the ledge when you have no jumps and are relatively high and away from the stage.
Try dash attack sometimes (as a punish). It's great lol, imo more reward than forward air(as a punish) since you get instant pressure with utilt at low percents and you pop them right above you for anything really. but it still has more risk than a retreating fair. However, you were trying to space against Marth range-wise and that's not a great idea usually with ROB with arm swingy moves. Nair/Bair on the other hand have great range.
When that Marth is being aggressive, if you get a good hit in which gives you enough space, laser him for free damage. He might run into it, or if he auto airdodges, you can take advantage of that to get free damage. ROB has almost instant super range on his laser, it is good.
I enjoy spotdodge abuse. It's scary as a mindgame trick and happens to work. I think the Marth was catching on at the end though.
I THINK THIS IS ENOUGH EDITS
last edit: good stuff