Is that what I think ? I do not know myself really well with steam , but I need it to my achievements in introducing project ?

Well afaik pretty much everything is included in the steamworks api...
drm; archievements; steam functions like friendlist, matchmaking, multiplayer stuff, etc.; even steam controller support and probably much more

@Ch40zz: Sorry but I don't understand it clearly enough, yet.

What exatly do you mean by 'DLL exported init function'?

And to access functions of the steamworks api, do I only have to create the function's prototypes in lite-c or do I have to wrap the functions in the c++ dll-project?

Sorry but this is all new stuff to me.

Congrats!!
Some time ago I've seen a game on Greenlight which was exactly like Swordlord but with fancy 3D Unity or Unreal graphics. I had thought you had switched engines and remade the game but apparently... YOU didn't.
Instead someone seems to have seen your game on greenlight (or somewhere else, itchio?) and just copied it, which is a shame. :< Can't find it right now but I will link it here when I do so.



EDIT: @Kartoffel: I was so bummed and stumped when I first had a look at the Steam API, especially because I didn't know any C++ - and I still barely do.
A good start is to read the DLL stuff in the manual and have a look at the content of the "sdk_" folders in your Gamestudio installation folder.
You can already have a look at the Steamworks SDK too, even if your game is not on Steam yet.

There is this one which looks very like a rip-off you swordlord.
http://store.steampowered.com/app/467900/?snr=1_7_7_151_150_8
But I've seen one that's I'd say is even more a theft of your work. I see if I can locate it..

Sorry for late response, didnt see that someone posted in here
What I meant is that you have to wrap all functions which make use of classes, because lite-c does not support C++ classes directly.
There are some "hacks" like using the vftptr and access all the virtual functions by index, but thats too tricky for most people, so wrapping all functions is what you should do.

, I dont think they copied Sworldlord (they seem to be atleast a 1 year or more working on it -> http://steamcommunity.com/app/467900/discussions/0/350532536097807193/) but the other one sounds quite likely.