Aw, you make my avatar sad.
Imperishable Night is considered the "easiest" game because of how generous it is with extra lives and bombs. You can change the number of lives you start with to some degree, and every time you continue, you get an additional extra life to work with. Additionally, easy mode is pretty dang easy. Most of those things don't really apply to extra mode though.
Recommendations for next game to play. Perfect Cherry Blossom if you want an older one, Unidentified Fantastic Object or Ten Desires for newer.