A mod a made over the summer that I lost the files to when I was still making it ~350 lines of code so not too much, I'll put up the files to see if any beginners want to play around with my code, or if someone wants to take over to project, go ahead but if you use any of my original code please give some credit.
I made this in eclipse luna, but it works in mars. I'm not proving the whole folder, just the src folder with the assets and textures. This includes 3 items: Slime Tainted Iron, Slime Boots, and Redstone Leggings. Slime Tainted Iron for crafting the boots, the boots launch you up a little bit of height to a maximum of 3 times and you take no fall damage. Redstone Leggings just speed you up. Have fun with my code! Keep in mind you will have to test this in eclipse or compile the mod yourself.