Rating:
First I cut the image into pieces each of which contained a single glyph and googled by image. After 10 minutes of searching I found that those symbols are from Proto-Sinaitic alphabet (https://en.wikipedia.org/wiki/Proto-Sinaitic_script). So it's easy to recover latin letters from them symbol by symbol. I also found a great picture:
Recovered text: alphabetevolution
And the flag is: ALLES{alphabetevolution}
