Game Face: Once Gaster's in control, some of his facial features manifest over Sans's face, such as his distinctive cracked head and drooping eyes.Delaying Action: Sans's fight with the Fallen Child, while ultimately hopeless in that the player still wins anyway, gives Asgore enough time to gather his resolve after being informed of everything the player did via Flowey, and the two set up an ambush which ultimately kills off the Fallen Child once and for all.Also, y'know, the player and Frisk are permanently killed, meaning that any hopes of successfully completing the route are dashed entirely.As is, everyone aside from Alphys' evacuees, Flowey, and Asgore are all dead, and none of them are coming back as the Player's permanent defeat means their SAVE FILE cannot be reloaded anymore. At least beforehand, the Monsters would all be brought back during the world's resetting/recreation, meaning that if the Player was stopped earlier, many more lives could be saved - even more if they chose to turn away from the path of Genocide to begin with. Despite the Fallen Child being defeated and the world saved from destruction, the situation is even worse than in canon.All they can muster is a simple "What just happened?" before Sans wakes up and begins the intro to Phase 3. Didn't See That Coming: The Fallen Child is caught completely off guard by Gaster's plan, and is thrown for a loop after noticing Sans hasn't died.Dem Bones: The main focus of this Fan Game is a battle with Sans and Doctor W.D Gaster, although whether the latter is/was a skeleton is up for debate.Beyond the Impossible: At the end of Phase 1, Sans gets hit while offering mercy, causing him to go into a speech asking why the Fallen Child is engaging in the Genocide Route so much, he waits, expecting to turn to dust, before noticing something that shouldn't be possible for him of all Monsters his HP didn't reach zero from that hit, but 0.0001, giving him another chance to end the Fallen Child.Even if you do replay the game twice and reach the final cutscene both times, the Fallen Child still does nothing to avoid being caught by Flowey. But Thou Must!: Even after killing Sans, you still cannot interact with the SAVE star in the Last Corridor, meaning that you can't use it to reload and avoid dying to Asgore and Flowey.In addition, the menu bones in the original Undertale's Sans fight are removed no matter what phase you're on. As you don't get any turns after the first in Phase 3, the latter is essentially useless at that point, though. Anti-Frustration Features: Every time you finish a phase, your HP is maxed out and your ITEMs are restored.