Hi, Tuloski!
Regarding the interaction and Easter eggs, yes it will all be.
Moreover, the correct sequence of runes on the obelisk opens up access to the dwarves runic mages. Or do you mean to introduce an additional secret on this element?
Just a few months will be available Kikstarter quest. There, everything will be tied to the interaction between narrative and the environment.
Guilds I was inspired from the series The Elder scrolls. I did not like to go through the main story and always went through the guild. I liked that it was possible to go through each guild there and eventually lead it. Passing the tasks of one guild did not affect the others. And I liked it. Moreover, it is more truthful. Since the trust system is logical for competing factions that divide areas. Local guilds do not divide areas.
In addition, there are many interesting non-standard guild quests with unique mechanics. I would like the players to try each of them. In the case of a trust system, you will only have to rely on a certain guild.
Yes, the stones can be spent not only on items in the store. We will soon launch Kickstarter and there we will create a big review on this topic. Stones can be spent on additional features in endless and rogue like levels.
If you have any Ideas how to spend gems it would be cool.
And also can you write 3 pluses and 3 minuses of the game? It would be very helpful!)