indie shmups you could try:
Blue Wish Desire and Blue Wish Resurrection Plus
Eden's Aigis
Magic Vigilante
Kaikan
Blue Revolver
Rolling Gunner/Rolling Gunner Overpower
Crimzon Clover World EXplosion
Graze Counter
Zero Ranger
Steel Vampire
Neko Navy
.Decluster and .Decluster Zero
Bullet Hell Monday series
Demonizer