un genio

I knew that "Engine of game is not supporting slopes sprites", that's why i asked.

Only tricks:
Engine of game is not supporting slopes sprites. It's only skewing already existing blocks in vertical direction and leaving bottom line (top, in case of upper slope) as it is. So:
First — I beveled an inner squared corners. Crossed blocks is looks different now, but that is main fix;
Second — I softened the gemblocks outlines, because right sloped sides had repeatedly strokes of brights and darks.

How did you do this?

GREAT

Nice!

Yep, that fixed it. I moved it's priority above the other texture packs and viola! Thank you!

I did. I t still looks the same. Thought though, I have a couple of texture packs installed. Let's try adjusting the priorites. Back in a moment.

Did you activated this in "Workshop" in main menu?

Well, I had high hopes for this. Doesn't seem to work?

Idk