First of all, thank you for wasting your time in my app, all help is welcome. Second, i had the same doubt about if i can use “Twitch” or not in may app name, i ask that question in december here [Simple Question] Brand Assets.
I think i can use the name on my app meanwhile there is a free version of it.
In decemer i also send an email to legal@twitch.com askin several things and another in january, and i dont have response yet. I will not wait forever, i upload my app in the way i think is ok, if they find my app to break some rules, i will change the name without any problem, even suspend it and reupload with all ok.
Again, thank you for your time 