Yes, they have like two very nice options

It's a Japanese restaurant. I don't think all their meat can be considered halal. You will have to ask them.

The cheapest bowl is $6,90. And almost nothing more expensive than $10.

No

Yes, there is one. It is specifically the soba salad, using buckwheat, though you might wanna ask if they use a bit of flour in the noodles, just in case

The menu is simple Japanese rice bowl based food. Simple menu selection. Everything around $10 or less. A lot of students and office workers go there for a quick cheap easy no fuss meal.