Ok,I'm making a biodome(invincible) so i spawn it ingame(I've got it all ready) but when it spawns,Its filled with purple,And I cannot enter it.
I really need to be able to spawn it (To test big things,Later i'm going to make taller and longer versions)

Help please?

Don't steal,You wouldn't want to anyway,And I'm not going to release till i manage to make a better FG and BG.

filled with purple?

Like a purple colored material?

If that's the case, you may have just gotten the wrong color for the Mat.

I can't fix it though,I've even copied and pasted the air colour(indoors) from the tunnel mat to the biodome mat and it still doesn't work.
Another problem is that i used the test material colour(Red isn't it?) to make the walls,yet the walls and such are still destroyable.
It would be alright if the purple stuff was diggable with the walls invincible,but it's the opposite.

check if it's in the CC pallete, other than that, I have no clue.

Your Foreground (FG) is filled with the purple. It's supposed to be Pink if you want it to be empty.
At least, I think.

And I put them all on palette, but I can't select it pre-game.

I give in,now it crashes on selecting the menu with it in.

Nononono that's easy to fix.
Very easy.

Just make a copy of the pallete, and paste your sprite onto it.
Then save that over the original sprite and it won't crash.

And you've probably just got the wrong colour for the background.

A problem I usually have when making sprites is MS Paint doesn't save in 8-bit images. I copy an 8-bit image, paste the sprite in. Then save the copy. Then I rename it.