Building

[MrBCraft]

you should add new blocks and fix the hotbar/inventory because its only stone

add decoration blocks and a way to craft/ smelt and i see you have iron coal and diamonds in the textures you could add plants to the game also you could add saplings and make trees grow
also you could add crafting to make plants, stairs, slabs, ect

I tried my best to build a house it was hard but i found 2 good trees that work well

[MrBCraft]

you could also add set amount of time for grass to change to dirt but it only spreads to surface dirt

[MrBCraft]

cactus seems to be transparent so i can walk thru it

seed seems to not work

and it seems you can only have 1 world