If you have a homebrew-enabled Switch, installing this collection is straightforward:
Psikyo Collection Vol.3 Switch NSP Free Download: Classic Shoot 'em Up Action Psikyo Collection Vol.3 Switch NSP Free Download
Physical copies of the Psikyo Collection volumes (published by regional partners like Arc System Works Asian branch) can still be found via import sites like Play-Asia or second-hand marketplaces. If you have a homebrew-enabled Switch, installing this