Emulator used: BizHawk version 2.8
Download the demo here.
YouTube encode here. Sorry about the quality since the AVI dump was 15 separate parts.
The demo has an incredibly good vertical slice of what the EX mode of the stages would be, so I decided to make what is essentially a vertical slice of what a potential TAS would be. There's a lot of cool tricks that could be done with weapon switching such as cancelling rain flush to get another out immediately, though weapon switches come at a cost of one lag frame per swap. I did bunny hops to skip both miniboss fights, which is certainly something I expect to be patched out on the full release. This still isn't the most optimal, such as not using rain flush in the shield attacker/batton room, but I already got frustrated enough making the encode and this is a demo anyways. At least all RNG is controllable with player inputs, including pressing the slide button while in midair. I turned down the screenshake to light for personal reasons and turned off extra graphical effects to cut down on some lag.