Well only Ocean and Regium (if he exist) know whole truth.
But from what i found Regium did chapter 1 and chapter 2. He had his own patreon page (it's still in the opening post -
You must be registered to see the links
, but now it's directed to Ocean SG account). While developing chapter 2 he asked Ocean to help and they worked on the second chapter together, and somewhere here Regium dissapeared from the thread and Ocean appeared. Ocean said that he wrote the story,
mocked Regium couple of times, Regium didn't answered on it at all.
The chapter 2 was released, still on the Regium page (i have 0.2 release and it's has Regium patreon link), Ocean said that all bugs should be reported to either him OR Regium so he still was involved.
But soon Regium completely dissapeared (his account here deleted) without saying nothing (Ocean also didn't said anything), patreon page changed to what it is now, and now Ocean says this in the FAQ,
which is kinda contradict to what was said earlier.
Honestly i even have a theory that Ocean and Regium are the same person who either created two patreons to make more money, or was afraid that begginer dev who creating two games at the same time would push away people, and made them under different names.
But it's only a theory that easily can be wrong.