A console app that moves the mouse and performs clicks.

MouseMover.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

/*
Ideas from 
http://stackoverflow.com/a/2416762/1363780
http://stackoverflow.com/a/24630693/1363780
*/
namespace MouseMover
{
    class Program
    {
        [StructLayout(LayoutKind.Sequential)]
        public struct MousePoint
        {
            public int X;
            public int Y;
        }

        [DllImport("user32.dll", EntryPoint = "SetCursorPos")]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool SetCursorPos(int X, int Y);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool GetCursorPos(out MousePoint lpMousePoint);

        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern void mouse_event(uint dwFlags, uint dx, uint dy, uint cButtons, uint dwExtraInfo);
        //Mouse actions
        private const int MOUSEEVENTF_LEFTDOWN = 0x02;
        private const int MOUSEEVENTF_LEFTUP = 0x04;
        private const int MOUSEEVENTF_RIGHTDOWN = 0x08;
        private const int MOUSEEVENTF_RIGHTUP = 0x10;

        static void Main(string[] args)
        {
            ConsoleKey key;
            MousePoint point;
            while ((key = Console.ReadKey(true).Key) != ConsoleKey.Escape)
            {
                GetCursorPos(out point);
                if (key == ConsoleKey.LeftArrow)
                    point.X -= 10;
                if (key == ConsoleKey.RightArrow)
                    point.X += 10;
                if (key == ConsoleKey.UpArrow)
                    point.Y -= 10;
                if (key == ConsoleKey.DownArrow)
                    point.Y += 10;

                if (key == ConsoleKey.Spacebar)
                { 
                    //Call the imported function with the cursor's current position
                    uint X = (uint) point.X;
                    uint Y = (uint) point.Y;
                    mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, X, Y, 0, 0);
                }


                SetCursorPos(point.X, point.Y);
            }
        }
    }
}

The idea here is to eventually record actions of the mouse and then repeat them.