RPG Evila package problem

So me and my co try to do a game.

It should be in unity couse my co do everything in this engine.

We got the rpg package from evila for inventor, but it only runs on pc right now.

I like to make a online store for guns in the game and a multiplayer open world that runs on pc, android, mobile, ps4, xbox one.

Somebody told me that you "only" need to program it like so and that its possible in every engine...

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And yes, this is no recruitment post.

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Also discord:

Joerg Federmann Composing#2898