Game can be modded if anyone cares

[♥♥♥♥ Goblin]

If the devs never intend to release additional content for the game, then there is still hope if people are looking for more things to do or improve (ie. different rings/armour/weapons; new enemies; etc) via modding.

Being a unity game, you can easily see the game code with any dll viewer (ie. dnspy). You can modify this code using a runtime hook (see below). Graphics/sound/assets can be added (I don't know how, but I've seen it done in other Unity games). Mods would need to be downloaded separately as well as the dll hooking solution (ie. using harmony to hook into dlls).

You need to know c# and a general knowledge of object oriented programming. Knowledge of how Unity works isn't needed nor is the Unity program suite. Your dll mods need to be coded in .net 3.5 - I don't know if Unity supports 4.x yet, it didn't 1.5 years ago when I was modding another Unity game.

Hooking:
DIY: https://www.♥♥♥♥♥♥♥♥♥♥♥♥♥.me/forum/general-programming-and-reversing/176942-accessing-mono-loading-assemblies.html (seems Steam doesn't like this url, LOL. It is "un known cheats" without the quotes/spaces where the hearts are)
Harmony: https://github.com/pardeike/Harmony

PS: I suck at C# and Unity hooking, but I played around with modding Subnautica for a little bit. If you have questions, I can try to help but I don't know how helpful I will be :P Subnautica used Harmony.

[ererbe]

I didnt mod a unity game but unity can support 4.x, but I think you need to switch in inside of the engine. So I dont know how you want to mod in 4.x when the game runs on 3.5 (I dont know on which it runs)

[SAK Kokain]

wow ! great news !