This is the Brackeys tutorial but better. This was also my first game.
Wait until you get an idea for the theme then think if you can do it in 3d or 2d based on your skills. but at the end of the day do what you will enjoy.
Good Luck.
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If you encounter Bugs please post here. check if the same bug is posted first if you unsure then post anyway.
Ideas For Graphics, story, Features Etc