This Mod makes a lot of things look like old minecraft. Like old classic/alpha/beta light rendering, old classic/alpha/beta fog rendering, old classic/alpha/beta sky and void colors, 2D floating items and more
But the best part is the option to slow swing. I think it would be cool to be able to swing your sword, tools, hand (Or maybe an option to choose a specific tool or item) slower. It kinda looks like you have Mining Fatigue but you are able to change the speed and it is just visuals :>