The storyline is one of the most important aspects of a game, especially when it is 2D as it gives you more time to think about it. Now, something I have found is that a gripping storyline is all about questions. You need to make the player, when something big happens, ask questions, and want to know the answers.
This is specifically important in continuous games, be they episodical or online.
First split your game into "chapters", for example, when a main event happens that is the end of one of your chapters.
Now think to yourself, three questions the player should ask.
If you can't think of any, go back and try again, adding in things and events to lead to those questions.
I'll post examples as I go along, from my game:
The player has just been forced out of a city by airship.
Ok, three questions: hmm. Let's try again.
The player has just been forced out of a city, chased by mysterious men in black suits, and has no idea where they are headed. They have taken with them a prisoner, who they have rescued from the men in black suits. They are running away by airship.
Three questions:
1. Who are the men in black suits?
2. Who is the mysterious prisoner?
3. Where are you going?
Now that you have your three questions, aim to answer one of them in the next chapter. For example:
You end up crashing the airship and landing in a place called "The Myre".
3 questions? No. Answer for a question? No.
On the airship, the prisoner introduces herself. You end up crashing an airship, following a great battle in the sky between the player's party, and the men in black suits. The airship crash lands in a mysterious place, that the player does not know the name of. The men in black suits left behind a strange object, by mistake. It glows.
3 questions:
1. Why are the men in black suits after you?
2. Where are you?
3. What is the strange object?
+
4. Who are the men in black suits?
5. Where are you going?
Now, by the end of the game / chapter / whatever, you do not have to answer all of these questions. They simply serve as a reason for the player to keep on playing. Think of it as an episode of eastenders:
Generic slater family member has sex with generic other member of cast. She misses her period.
Questions:
1. Is she pregnant?
2. Will (boyfriend/father/friend) find out?
3. Why are you watching eastenders?
This is specifically important in continuous games, be they episodical or online.
First split your game into "chapters", for example, when a main event happens that is the end of one of your chapters.
Now think to yourself, three questions the player should ask.
If you can't think of any, go back and try again, adding in things and events to lead to those questions.
I'll post examples as I go along, from my game:
The player has just been forced out of a city by airship.
Ok, three questions: hmm. Let's try again.
The player has just been forced out of a city, chased by mysterious men in black suits, and has no idea where they are headed. They have taken with them a prisoner, who they have rescued from the men in black suits. They are running away by airship.
Three questions:
1. Who are the men in black suits?
2. Who is the mysterious prisoner?
3. Where are you going?
Now that you have your three questions, aim to answer one of them in the next chapter. For example:
You end up crashing the airship and landing in a place called "The Myre".
3 questions? No. Answer for a question? No.
On the airship, the prisoner introduces herself. You end up crashing an airship, following a great battle in the sky between the player's party, and the men in black suits. The airship crash lands in a mysterious place, that the player does not know the name of. The men in black suits left behind a strange object, by mistake. It glows.
3 questions:
1. Why are the men in black suits after you?
2. Where are you?
3. What is the strange object?
+
4. Who are the men in black suits?
5. Where are you going?
Now, by the end of the game / chapter / whatever, you do not have to answer all of these questions. They simply serve as a reason for the player to keep on playing. Think of it as an episode of eastenders:
Generic slater family member has sex with generic other member of cast. She misses her period.
Questions:
1. Is she pregnant?
2. Will (boyfriend/father/friend) find out?
3. Why are you watching eastenders?