For Gunvolt 1 posts:
Information post for future use.
Gunvolt 2 as of October 2019 is only out for both 3DS and Nintendo Switch.
The 3DS version early 1.0 release had a freeze bug against Tenjian's 2nd encounter but only useful for RTAs.
The early Nintendo Switch via Striker Pack release and presumably all 3DS releases had a zipping bug in Teseo's stage: https://youtu.be/8sYm9p2bh84?t=883
It got fixed in the later updates for Switch.
Switch version has the advantage of 60fps support over 3DS's 30fps. Right Stick input is mostly minimal directional input to select SP Skills followed with a Right Stick Click to activate it.
Copen can execute a reload cancel to abuse infinite bullit refill through 3 methods.
Twinbunker's high jump (requires defeating Desna)
Going down through a semi-platform
Code of Shovelery (requires clearing Shovel Knight battle before starting up a new game/opening a file).
Copen when done TAS'd will look very speedy to watch.