It's thought based, thoughts>glares>punches
Not when said danmaku damages the spirit, and like I said, Goku doesn't resist that, it's also shown that
even regular attacks from her just erase youkai which again are spiritual in nature, so Goku would basically need to power through thousands of projectiles that induce Hakai-like effects on his spirit, which is unrealistic as Reimu's danmaku is among the top tiers in the verse that is well known for their complicated patterns.
Barries in-verse are conceptual as they're boundaries, Yukari's profile (Or any of the Gods's really) explains boundaries's conceptual nature so ye.
Goku never destroys the arena or anything in-character, he always wants to fight people when they're at their best, and yes he is a bit more bloodlusted-ish in MUI, but not to the extent to just go to the kill, he doesn't go completely berserk basically, it would be weird for him to just "you know what imma just blow up the universe", he didn't even try that in MUI he just kept puinching Jiren and shit, and if he did that it'd take too long, Reimu would float away, Goku would die due to lack of oxygen, done.
Connect..? What does that mean? You mean they have to touch Goku to affect him? Yeah, aura doesn't neg it as he only has that aura when he powers up or when he's already clashing with someone, it's not passive or anything,
besides Reimu can just put a border in his core (bypassing the aura basically as she's attacking his boundary directly) and done
Thank you.