Animation wise I really liked this, though you definitely played up the edgy badassery side more than the usual vibe of SMRPG. Which is totally fine, the fight scenes ended up really cool regardless. A little controversial maybe but I don't think the song fit, it wasn't just the forest theme which I appreciate, because that would be kinda boring when we have a million of those whenever Geno is brought up, but the emo vibe and AMV style presentation came off a little silly at times. Also couldn't stop staring at Geno's legs, does he not have clothes on the bottom on his in game model? really stood out for some reason.
Also, the scene with Geno Whirl was probably my favorite part of the whole thing. Great animation there and fit the edgy take just fine, that was always my favorite ability to use. The last bit with the Smash Bros invite kind of takes away from the greater picture though. You spend a bunch of time making him badass, then compare the need for that with the need for a for fun Nintendo tournament. Those invites are being handed out for that, not subspace emissary or world of light. Everything else about it was great though.