I honestly adored my time with this game while playing co-op with my girlfriend! Yeah there are some funny bits to it thanks to being a fan made game, but the level design was really fun and engaging with many different concepts and ideas used, probably more honestly than any of the official NSMB games. The difficulty isn't very high but some stages in the last two worlds were pretty intense gauntlets, and I think the difficulty curve is really smooth. Also REALLY enjoyed the music, which I was surprised to learn was done by the team themselves! This was the hack I've played all the way through for a game but I think it was lovely.