I had a minute, so I thought I'd throw out my opinion of Cosmic Geno. I love how he plays uniquely! All of the custom stuff you've done is remarkable. That being said, there is still room for improvement.
First- I find that in one-on-one matches, I can't kill on the ground unless I hit with Geno Whirl (which is lovely by the way). Here are some suggestions: Make Geno Beam storable, make forward tilt a bit more like wario's (to emphasize the rocket punch and ko aspect), or make his forward smash reach a tad farther (maybe as it goes out farther, it sinks a little). You might also try making Geno Blast like pikachu's thunder, but slower, and still put him into fall state. Another idea for forward tilt is to make a samus rocket wood colored and have it reach out and then retract.
Second- In the air, I find it easy to connect with his aerial, but I find that they don't knockback enough (plenty of % though). I suggest making down air hit a little to the side (either, like fox's dair) to give him a good hard hitting aerial, that doesn't require setup (like fair). Or, you could change bair to something more concrete (like another rocket punch move), so instead of just the fire puffs you could have the current ftilt effect shoot out a few times at a few different angles.
Third- Fighter Geno has the Ness head nod as a taunt, but this one doesn't. I say its a perfect fit for the Geno taunt! I think its a must (however small).
Last- Overall, I find that the lag after certain moves is a bit disproportionate. Ftilt, might need a bit less start up, but the ending lag is necessary to keep it in check. Uair and Dair, mostly, should have less ending lag in my opinion.
The only other suggestions I can make are to graphically change jab and Geno Blast. That will go a long way to make him feel more like Geno (just like original sound effects would, but I am under the impression that that is impossible). Other than that, keep up the good work! Thanks for giving me the opportunity to weigh in on one of my favorite Video Game characters.