The game is about halfway done and none of the romance routes are complete. There should be romance routes for Max, Rune, and Burry. There will likely be routes for Alan, Teak, and Thistle as well.
So far, the romance routes follow the general flow:
1) Intro (Complete)
2) early day/afternoon (Complete)
3) bath scene (In-progress)
4) Nighttime (In-progress for Burry only)
5) Ending (sex) (in-progress for Burry only)
Almost all the characters currently have some level of lewd content in the game. Though some can be harder to find.
The game also keeps track of what events have been completed or not. Completing an event can unlock additional content in other routes and/or past events in the game. If you can't see something, it may be because you haven't yet done something else in the game.