I think the theme in the game works well… a nice light v. dark motif. I really do like the idea of collecting runes and mixing them for different effects. Makes for the potential of some really fun puzzle solving!
That said, I felt there was too much focus on the rune magic and less on the dungeon crawler aspect. That is not to say there was anything wrong with the mechanics in the game at all, but with the runes focusing on light v. dark and the idea that Sol and Lun are these different gods, both of their respective mazes felt identical. Additionally (and this may have just been something I missed), other than looking for the statue within the maze, there seemed to be little else to warrant exploration within either maze.
In regards to the rune magic itself… I did like the idea a great deal and it would be a very cool mechanic in a dungeon crawler over all, but I kept getting tripped up with needing son or moon runes to be activated before using any of their spells… especially when I need to use the sun or moon runes in the act of casting the spells in the first place. Additionally, while the harmony spell is a cool concept, it felt strange that I couldn’t use it directly outside of the central chamber. That said, it would have been strange if I could just constantly spam Harmony within the sun or moon mazes too. Over all, it’s existence (while I get why it’s there) somehow comes off as out of place. Perhaps the Harmony spell should be the only rune for bringing up the mini map (as that feels like a pretty neutral effect) and it can still exist to mix with the other runes. Also, when returning to the central chamber, I feel the player should be automatically brought back into harmony.
I think the ideas in this game have some really solid potential! Also… kinda disappointed I missed the boss battle due to the bug near the end of my play through. That boss really did look cool!
Here a link to me playing your game on my stream :D