At this stage, the game contains the entire main storyline (and all the locations necessary for this - 20 locations!). Each location is randomly generated every time! Each location has unique monsters that are also randomly generated. Some locations have bosses that will reward you with unique items!
The game also has a tutorial. I highly recommend to complete it (it takes 5 minutes). It demonstrates some basic mechanics, knowing which, it will be much more interesting to play!
What's planned for full release?
More details!
More side quests are planned.
More bosses.
More unique items.
More achievements.
Additional locations (not on the main line).
Perhaps the final version will have a step-by-step mode.
Improving balance (I think the community will help improve balance!)
Translations into some other languages.