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This is a paid asset, but now you can download Procedural Dungeon Generator Free.
Detail this asset from Unity Store: Original Link
Procedural Dungeon Generator v1.2 (Latest version)
This is a 2D Dungeon Generator.
Each dungeon is different, you will never see 2 equal. Just drag the prefab to your scene and let the magic happen.
Asset features:
+ Dungeon Generator.
+ Character Controller included.
+ 2D Camera.
+ Chests.
+ Mimic.
+ Fountains.
…
Note: Please do not try to make many rooms or very large rooms in insufficient space.