Is the game simple at the beginning, starting with very few options?

What are the next, more complex, entities that should be introduced later on in the game?

Who is this game for? What players are you targeting?

How popular is this genre?

Are there any fan communities for this genre/type of game?

Is it a game people would watch on Twitch or Youtube?

Is there something in your idea that hasn’t been done before, or that no one has done it like that?

Does it have an unexpected element/story?

Is it memorable? (Will users care about what’s happening in the game? Are the characters emotionally attachable?)

Are there any hooks? (e.g. beating the game, role-playing, high score, discovery, customization, relationships)

Could it have a sequel? How about building a brand?

Is it something people would want to spread the word for?

Can you build any relationships; can you compete?

Can you play together with a friend?

Do you get instant satisfaction?

Will it stay fun in time?

What skills does it challenge or how does it put your mind to work?

Does it have grow abilities and the possibility to gain mastery of new situations and challenges?

Still, is it accessible to everyone?

Does it have something that will keep the player coming back to play every day? Can it create habits?

How long does it take to finish the "main" part of the game and how much does it matter to the player to complete the "extra" part?

Would you imagine this game in the top grossing charts?

Can you identify a proven monetization framework that can fit the game?

Is it something the team is excited to make?

Do you have the skills and resources to make this game?

How long, do you estimate, it will take to have a first release?