This is a very hard game to understand, but when you get the concept, it's pretty fun! Graphics wise it's a bit confusionary and could still be improved in my opinion, but its mechanics are fascinating: the "rune combos" are surely a neat concept for a game! Tho, those could use some better implementation as the concept is still a bit rough (as well as a more comprehensive tutorial on how to use them), I think maybe having more visual representations on what runes are effective against what enemies, more rune-based puzzles and maybe even some bosses that use the rune combo mechanic would be a step in the right direction. Ad for the theme, it's just the setting which I really wanted to be more explored: maybe descending deeper the enemies will be a lot more eldritch, and the setting darker? As of now, I couldn't really see the theme implemented in game, other than visual features. I think this game has a lot of originality for a game done in 7 days, and if used well, it could evolve in a very interesting way. So good job on that! :D