ASYLUM is an independent game, but not unrelated to the SEQUEL series. You play as マリス・プランダー (first name’s Malice, surname’s probably Plunder), waking up in the land of Asylum with no memories other than your name. Your quest quickly becomes to escape Asylum together with the other inhabitants of the base, even if that means dying and coming back to life repeatedly: the protection of the stars ensures that no one in Asylum dies unless their heart breaks.
Thematically, the game continues exploring some of the ideas SEQUEL colony did, but in more detail.