Yeah, that's the funny story. Guys from Cool Math Games worried that my non-commercial fan-game could provoke a copyright claim from Nintendo (you never can be too cautious I guess). That's why they asked me to change the main character's sprite and the name (because it didn't make sense without Mario reference) before publishing this game on their website. They mentioned that it's a reskin of 1985 in the description on their website but people rarely read those. Should've put the disclaimer inside the reskinned version itself xD
PS: the funniest part were the people who accused me for stealing Another Gentleman's Adventure. Yet they somehow didn't notice all the other Mario references that left in the game like mushroom that makes you big, green pipes, enemy design, etc. Usually I pointed out that to end any pointless arguing about which game was the original.