Deltarune, like Undertale, is a role-playing game that uses a top-down perspective. The player controls a human named Kris and has to complete objectives in order to beat the game. During some parts of the game, the player is allowed to choose attacks of other characters in the game. Similarly to Undertale, Deltarune has bullet hell sections, in which the player must move Kris' SOUL around a boxed area while avoiding enemy attacks. Getting close to the attacks (without actually touching them) will give the player TP (Tension Points), which allow team members to use spells such as "Pacify". Defending also increases TP, albeit by a much larger amount than dodging attacks. Combat is performed similar to most standard turn-based role-playing games, choosing from a set of actions such as "Attack" or "Spare". While the goal of the game is implicitly to avoid fights and spare monsters, this is made difficult in that Susie, who is not initially controlled by the player, would rather attack enemies than spare them, and thus the player must also determine actions to prevent Susie from hurting enemies if they want to show mercy.