@Mustang it's more of a rebalance, i only uploaded it so everyone that played my server could easily get the datapack. it's not REALLY meant for people to just download and use on there own, though you're more than welcome to try it. It's a little weird atm as it was designed around the old version of the tetris mod and with a modified "Customizable Tetris" edited by me for personal use.

Is it a buff or a nerf in terms of how many slots a item occupy?) - would be nice to have a better screenshot with an ingame example of what is changed.