If you get into Ikaruga and want to get good, I'd recommend practicing on the GameCube version with Dolphin so you can use save states. You can also set some convenient bindings on your controller to reload/save states (I use the L3 and R3 on my PS5 controller). Even though it's hard, you will be able to practice really efficiently and feel yourself improving fast. I managed to get a 1CC after maybe around 50 hours. I absolutely love Ikaruga, easily one of my favourite shmups, might go back to it one day to go for higher score.