You can start your dungeon 10 levels before your high floor beaten in multiples of 5. After beating 15 you can start at 5, after 20, can start at 10, etc...
Game gets boring after some time. After some time playing a big amount of birds starts to come just in front of you, stars are only helpful cause of the speed gain, the money they give is very little. This game could be better, hope new updates are coming.
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You can start your dungeon 10 levels before your high floor beaten in multiples of 5. After beating 15 you can start at 5, after 20, can start at 10, etc...