Very nice and ambient! I like the slow progression! It feels well balanced as it is just confusing enough to create a challenge, but still simple enough to not become frustrating! I also like that you get like 1-3 levels to get acquainted with each rune before a new one is introduced!
I did find the music loop a bit too short so it became repetitive after a while, but aside from that, it was very nice and fit the aesthetic very well. The movement was a bit annoying but that might just be because I don't usually play games with grid based movement xD
The art style was veeery pretty and everything fit together nicely! For it being an SP1 game, it is very very good!