Cross posting from the Gundam OT, since I missed this thread.
Japanese players' complaints are spot on. Controls feel laggy, part switching on the field unnecessary, breaking boxes is not fun and the game has slowdowns even on the pro.
Huge disappointment after each of the previous game in the series being better than the previous one. Definitely not grabbing this one, at least not day 1.
I very strongly recommend anyone interested in buying the game on release to check out the beta:
https://store.playstation.com/ja-jp/product/JP0700-CUSA12767_00-NGUNDAMBREAKER1M
Getting to the mission is simple enough and you can probably do it fairly easily even if you don't know Japanese.
The game starts with a tutorial, but looking at which buttons the game wants you to press in the tutorial window, should be enough to fumble your way through it.