I recently played all the Treasure games before the PS2/Gamecube era and this is how I’d rank them from weakest to best
Rakugaki Showtime
YYH Maikyo Totisusen
Silhouette Mirage
McDonald’s Treasure Land Adventure
Bangai-O
Sin & Punishment
Guardian Heroes
Dynamite Headdy
Light Crusader
Mischief Makers
Alien Soldier
Radiant Silvergun
Gunstar Heroes
Rakugaki Showtime
YYH Maikyo Totisusen
Silhouette Mirage
McDonald’s Treasure Land Adventure
Bangai-O
Sin & Punishment
Guardian Heroes
Dynamite Headdy
Light Crusader
Mischief Makers
Alien Soldier
Radiant Silvergun
Gunstar Heroes