It took me a while to figure it out, but I believe I have an explanation for you. You see, it's all about roguelikes.
I'm from Poland, and in here, rogue - alike (or just roguelike) is very similar in writing to another word - rogalik (it's a transformed word of rogal - as a form of endearment, or meaning small/cute version of it - sort of like "-chan" in Japanese, so you can just imagine it as rogal and rogal-chan). As words already present in the language, both are used in local gaming community as a slang term for roguelikes.
Now, how does it relate to bagels? As it turns out, rogal means... a croissant (or at least a local version of it).
A dictionary here lists рогалик (which is basically a cirilic transcription of rogalik in 1:1) as a Russian word for roguelike as well (not a surprise, since Slavic languages are still very similar to one another in many places, so the process of coming up with it was probably same for Russians as it was in Polish).
The fun part comes when you use... Google Translate xD
I have no idea why, but for some reason it translates рогалик as bagel. o.O
I guess despite similarities between our languages, these madmen started calling not only croissants, but bagels with same name as well, and it's been registered by a dictionary. Or perhaps, somehow this particular entry has a mistake o.O I can't say, since I've never bought anything in Russian bakery :/
Anyway, it's meant to be "action rhythm roguelike", but probably was "professionally" translated in Google translator and slapped to English version of store page without checking.
Hope you enjoyed the solution to the mystery :3