Excellent game! Of all the eat your tail games i think this might be the most creative one, and also must fun to play. It has a puzzle feel to it, "what are the closest runes i can get to with this size" without feeling too difficult, and also has a real time element, without being too punishing. im glad you dont lose by hitting the walls. i can definetly see this being a full fledged game if you want, there are avenues you can explore with different obstacles (some may move or teleport etc) and you can also expand the puzzle (ordered runes, or runes that change the layout, etc)
it would also work well in phones.
For an easier mode i could also suggest it only moving when you click for example.
great job, great game