Gosh, I forgot to leave a review, huh?
Mario handles like a dream in SRB2, and he fits like a glove if you're at all familiar with his 3D outings. He's got triple jumps, wall jumps, long jumps, spin jumps--the list goes on, and that's before his arsenal of power-ups and trusty hammer come into play. There's a lot of novelty and nuance to this character, and I can't get enough of it.
Though he's easy to pick up, Mario has an impressively high skill ceiling. Knowing how to make the most of each tool in your kit will let you finagle your way past almost any obstacle in your path. Even challenges designed for characters like Knuckles or Fang aren't enough to stop Mario, and overcoming those just makes you feel unstoppable. This might be the first mod that has made me genuinely consider attempting a speedrun.
All of this holds especially true when you take Luigi into account. Not only does he play like his usual, floaty self, but even some of his acrobatics and power-ups have their own special flourish. Luigi's scuttle jumps and wavy, green fireballs helps him stand out from his brother in a big way, but not so much that you can't pick him up right from the get-go. The man in green got a lot of love, and it shows.
On top of everything else, Mario series veterans will appreciate how elements from all across his storied history come together in one complete, faithful package. This ranges from broad strokes like his impressive power-up variety (including Gold Mario from the oft-overlooked New Super Mario Bros. 2), all the way down to the minutiae of things like coins and unique sound effects. Special kudos for custom colors like Mondo and Groovy, for that wonderfully classic feel.
All of which is to say... a lot of love and care were put into these characters. Everything about it exudes quality, accessibility, and attention to detail, and I'm wonderfully excited to see what else is in store. If you haven't tried the bros. out yet, know that they have my glowing recommendation.