This game is essentially Fire Emblem: Slightly Different but Mostly Worse. The game never really feels like its own thing and most of the core changes to the Fire Emblem experience don't really pan out well at all. Probably the best changes here are no forced deployment for the main characters, most support conversations reference and play off of story beats and the 2000 health raid bosses are actually fun.
My favourite level is absolutely the level that tries to do the Ike and the Black Knight gimmick from Radiant Dawn. Because of the aforementioned no forced deployment gimmick, you don't have to deploy Ike! If you don't deploy the main character, you can still complete the level by defeating enemies with your other units, as defeating an enemy does damage to the boss or something. Can't actually verify that's how it works but after like 9 turns I won the level for no reason so that was funny. Dumb game.
My favourite level is absolutely the level that tries to do the Ike and the Black Knight gimmick from Radiant Dawn. Because of the aforementioned no forced deployment gimmick, you don't have to deploy Ike! If you don't deploy the main character, you can still complete the level by defeating enemies with your other units, as defeating an enemy does damage to the boss or something. Can't actually verify that's how it works but after like 9 turns I won the level for no reason so that was funny. Dumb game.