Cthulhu Saves the World is a role-playing game published and developed by Zeboyd games. In the Fall of Cthulhu, the first chapter of the game, the player will take control of Cthulhu and meet Umi who will join him. After going through a cave and defeating Star Terror, the two heroes will find the city of Miskatonia.

1. After the introduction, walk north and open the treasure chest to get three 1-Ups. Walk west on the beach until you find a young girl captured by two monsters. Use regular attacks to kill them, you will get your life back after the fight. Choose your level-up. Umi joins your team.
2. Head north and enter the cave. Once inside, go to the light spot and save your game. Follow the path, take the stairs and head south of the lake. Fight any enemy you encounter. Take the stairs up and at the intersection, go west to find an armor item, the fleece tunic. Go back to the intersection, go north and at the intersection with the two stairs, take the left one and follow the path. You will find a stair that leads you to the next level.
3. Head east. At the intersection, continue to find a treasure chest containing 5 potions. Go back to the intersection and head west. Get under the bridge and continue to find the exit.
4. Once outside, go south and head west. Cross the bridge and get to the ladder. Climb it. You will meet a group of heroes. You will have to fight them.
5. I recommend driving them all insane using your techniques. Focus on the cleric first and the thief after. Use Deathblow when you have enough combo to deal a great amount of damage to the hero. 
6. After the fight, continue the climb the ladders until you reach the top, head south to the next ladder and go down a level. Enter the cave.
7. Inside the cave, follow the path until you reach a lake. If you take the north path, you will find a treasure chest with 75 gold. Then take the west path to continue. After the stairs, head north and turn left when you can to find a stairs going down a level. Cross the bridges and exit the cave.
8. Outside, take the ladder on your right. You will see the entrance of a cave. Do not enter yet and go north-west to find an iron sword for Cthulhu. Now, enter the cave.
9. Follow the path inside the cave and defeat the enemies attacking you. You will soon reach an intersection. The left path leads you to 150 gold. The right path leads you to the stairs for the upper level. Once up, save at the light spot and exit the cave.
10. Turn left and take the ladder. Head east and cross the bridge. A Star Terror will appear and attack you.
11. The Star Terror has 950 HP. Start by making it insane and blind it with Umi. The boss with then cast a ailments healing spell but won't attack you. Continue to use an insane tech with Cthulhu and blind the boss with Umi. When your combo meter reaches 18, Star Terror should have few HP left. Use Cthulhu's Deathblow to kill the boss.
12. Finish to cross the bridge. You will enter the world map. Head east and enter the town of Miskatonia.
13. Once in the city, you can find a shop south of the entrance where you can buy weapons and armors. When your are done shopping, go to the university which is the first building on the east when you enter the town. You can learn a little bit more about the game's mechanics by talking with the people inside.