Mikan Muzou (未完夢像)/theories

Soutarou is Possibly Wanting to Achieve a Goal, but is Feeling Restrained, Guilty, and Scared to Try
This theory is mostly based on the Effects Soutarou uses.

If one uses dream language, the effects (can) relate to feeling restrained, guilty and scared. Some of the effects have a little positive meaning, such as trying to break free from those negative emotions. However, since Soutarou is still in a room and doesn't seem to attempt to be free from those items, it seems he is still struggling to release them. It also seems he is working hard, but he may be just deceiving himself.

As for the environment, it is possible Soutarou is dwelling on past things about the thing(s) that may has/have been hindering him.

Soutarou is Writer with a Creative Crisis
Soutarou can be a writer, with creative crisis, its can be proved by a fact that in real world Soutarou have a something like a typewriter on a table, also after collecting of all effects Soutarou get a some kind of book in dream world, same book also can be found in special white room with a bloody dresser, this book can be a work of Soutarou, but he can't complete it from the crisis, btw about crisis, when Soutarou usin black cat effect crawling through some cave, on a background can be seen some silhouets on a chair and last of them in pose of depression, it seems that silhouets shows Soutarou with a creative stupor.