I played it through and enjoyed the whole experience quite a lot. I love the auto battle system and the constant improvement of your party through the generous loot and XP, that made the game quite addictive to me! 🙂 I agree that the levels are a bit too big and repetitive, I had some trouble finding the portal that lead to the next level and lost some time backtracking.
It would have been nice of each level could have had its own wall and floor textures, or at least a different color scheme, to give the impression that your are progressing, and also I wish there was subtitles because English not being my first language, I'm sure I missed some of the lore/hints.
Loved the sound design too, especially the sound of an enemy approaching. This kind of minimalistic experience is right up my alley. Very solid entry!