Very cool! I found the runegrid rather unintuitive to use (I guess you can't place freely but have to slide runes in from the edges?), but I love it as a concept and the way groups of runes multiply their power is super neat. The graphics are a bit indistinct and I had trouble making out what some things were.
I did encounter a bug on my first play where I could move onto the portal but it wouldn't take me to the next level. I couldn't reproduce it afterward though.