I just got the chance to play through this, I really liked it, Rumina's story was fun to experience! I also REALLY liked how the dithering effect worked to make the lighting in the game feel, I played mostly without the CRT filter and being able to just barely make out things in the distance because of the dithering i thought was really fun and something I personally havent seen much(usually further stuff just gets culled).
The dungeon crawling itself was fun, not giving players a map is usually a choice I personally dont like, but it was very much the correct one for this game, creating a mental map of the areas was fun, though i think the final area could have done with a bit more horizontal exploring.