I have played for a while now and noticed a few things.
1st: While i was negotiating with Nekomata, i noticed Russian text e.g. when she was asking for a Homunculus (the no message seemed to continue to appear in Russian). Later in one of the conversations there was another Russian sentence.
2nd: There is way too much oneshot spam, on the earlier floors the blonde demon (forgot the name) and later then angels. Due to the fact that they can apparently always instakill you and saves are manual only, it just gets exhausting to encounter them (also revives are pointless due to the fact that you immediately get the game-over screen).
3rd: It sometimes gets very hard to see where to go next, as the game is not only barely illuminated, you also only have a map where you already stood, so in case that you missed/overlooked a passage, you have to re-explore the entire floor. For this problem i propose showing walls on the minimap where you where, or light-grey tiles near you where you haven't been yet.