Does Sin & Punishment: Star Successor count as recent? It's 6~ish years old already, but most of the bosses are pretty cool. Sure there's a few regular "squad leaders" in there, but otherwise there's a lot of variety on display. Some are sidescrolling, others have melee focus, some are about deflecting, there's a freaking boxing match in there, bosses with multiple forms, one includes time slowing/speeding elements... Suppose shmups are always decent at bossfights though.