Basic Trope: A situation where Video Game designers deliberately include a way or ways to make the game Unwinnable.
Straight: Albert has to find the legendary gear of the great hero Miran. It's possible for him to miss collecting the Pendant of Power or Gauntlets of Greatness before the areas where they are hidden are destroyed by Marduk. If this occurs, the game is rendered Unwinnable.
Exaggerated: Albert is supposed to gather four other Chosen Ones and all of the legendary equipment in order to face Marduk. It is entirely possible to miss recruiting Princess Velvet or Pike, or to destroy a Load-Bearing Boss without realizing that one of the legendary treasures is still hidden deep inside the dungeon you just wiped out. This makes the game Unwinnable.
Missing an item makes a whole side-quest unwinnable, but not the main plot
Zig Zagged: Zig Zagged: The player is told flat-out that Albert needs to recruit the other Chosen Ones and warned that the legendary equipment is well-hidden and may be "Lost Forever to the sands of time" if they aren't careful. It's also impossible to miss recruiting Marco or Celeste, and several warnings are given whenever the player is about to potentially bypass a vital item. On the other hand, Velvet is difficult to read and doesn't officially join until late-game, and only if treated well, while Pike can be Killed Off for Real without the player even realizing you can rescue and recruit him, and other equipment can be accidentally missed.
Averted: There is no way for the player to accidentally miss something important and make the game impossible for them to win.
Enforced: The designers want players to pay more attention to the world they've created, so they make it that a player who isn't paying attention will stumble into one of these traps and screw themselves over without realizing it.
Lampshaded: The game in a bit of niceness, causes the save points to refuse to save for you after a MacGuffin is destroyed, stating "You cannot win, assisting you now would be cruel."