[Number Wizard] Back to the basics

After a break from programming, number Wizard is the first project I work on with a smile on my face. I am excited about all the challenges; I decided not to deviate too much from it, but feel free to comment, suggest changes, or ask questions about it.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class NumberWizard : MonoBehaviour {
    [SerializeField] int defaultMin = 1;
    [SerializeField] int defaultMax = 1000;
    int minNumber;
    int maxNumber;
    int numberGuess {  get { return (minNumber + maxNumber) / 2; } }

	// Use this for initialization
	void Start () {
        SetupGame();
        PromptIntro();
        GuessUserNumber();
    }

    void SetupGame() {
        minNumber = defaultMin;
        maxNumber = defaultMax + 1;
    }

    void PromptIntro() {
        Debug.Log("Bienvenido to the number Wizzard");
        Debug.Log("Pick a number and don't tell me what it is...");
        Debug.Log("The number must be between: " + minNumber + " and " + maxNumber);
    }

    void GuessUserNumber() {
        Debug.Log("is your number: " + numberGuess + "?");
        Debug.Log("Press \"Enter\" for if the answer is correct; \"Up Arrow for\" Higher than " 
            + numberGuess + ", \"Down Arrow\" for Lower than " + numberGuess);
    }
	
	// Update is called once per frame
	void Update () {
        if (Input.GetKeyDown(KeyCode.UpArrow)) {
            ProcessHigherThan();
            GuessUserNumber();
        } else if (Input.GetKeyDown(KeyCode.DownArrow)) {
            ProcessLowerThan();
            GuessUserNumber();
        } else if (Input.GetKeyDown(KeyCode.Return)) {
            Debug.Log("YOUR NUMBER IS " + numberGuess);
            PromptRestart();
            SetupGame();
            PromptIntro();
            GuessUserNumber();
        }
	}

    void ProcessHigherThan() {
        minNumber = numberGuess;
    }

    void ProcessLowerThan() {
        maxNumber = numberGuess;
    }

    void PromptRestart() {
        Debug.Log("<color=#0000ff>LETS PLAY AGAIN!</color>");
    }

}

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