This modpack is an addon to the origins mod that allows you to be a red slime! (It is not my code, I only changed the colour and the source code has been attached below). It uses fabric API and allows you to have all the features from the original slime origin addon except you are red.

This addon gives you the following powers:

Improved Jump Height
No Fall Damage
Shrink to half your size (and max health) instead of dying
Bounce on any block like it was a slime block. (Can be good and bad)
Burn in hot biomes (Anything with a temperature score 1.0 or above on this list)
Reduced Movement Speed
Increased jump height on slime blocks

THINGS NEEDED!!!!!

Here are links to other things that are required to download in order for the code to work:

The origins mod: https://www.curseforge.com/minecraft/mc-mods/origins (can't run an origins addon without the origins mod itself).
Pekhui: https://www.curseforge.com/minecraft/mc-mods/pehkui (allows you to change size).

THINGS THAT HELP THE GAME!!!!

This is a link to a resource pack that you don't need for the mod to run however it helps the mod make sense as it changes all the slimes and slime related items to be red: https://www.planetminecraft.com/texture-pack/red-slime-4840605/

SOURCE CODE (NOT NEEDED TO DOWNLOAD)

Here is the source code that I mentioned earlier: https://www.curseforge.com/minecraft/mc-mods/slime-origin

RED SLIME