You have full permission from me to use GaMetal songs in any of your videos, streams, or any other forms of content (as long as it is nothing that can be deemed offensive).
HOWEVER
There is one important base I must cover: since these songs are covers/arrangements, I don’t own the rights to the originals, so there is always a chance the composers or whoever owns the rights the original songs could take issue (which extends to covers/remixes/arrangements/etc). On YouTube it’s possible this could lead to a partial or fully demonitized video from a copyright claim. I’d also like to note that I’ve only ever seen copyright claims in this scenario (which only leads to partial or full demonitization and can easily be remedied by removing the video and replacing the problem song) not a copyright strike, which is the bad one that dings your channel record for a bit.
The same applies for other platforms (Twitch, Tiktok, etc), it could get detected and lead to something like partial/demonization or a portion of a VOD getting muted.
These instances are rare and I’ve yet to see anyone receive any catastrophic consequences (like the dreaded copyright strike I mentioned above) from using GaMetal songs in their videos, but I just want to make aware that these instances are beyond my control. I want you to use GaMetal songs in your content! 🙂