Alright I finished this now and it's very much recommended. Nice 4 hours long 2D souls-like that is sufficiently challenging and unsettling.
Also you can start a new game playing as one of 4 bosses once you've defeated them. It changes nothing story-wise but they have completely different skillsets and are fun to play. Sometimes a bit broken though (well they
are bosses aren't they
) I did a second playthrough with one of them to see the other 2 endings (there are 4 and you can see 2 per playthrough because of the conditions) and it took me about half an hour because he was OP. Good fun.
About to try it out myself soon