(I'm writing with Google Translate, I hope my answer won't be distorted by the automatic translator)
Version 0.2.X contains a total of 3 completable dungeons. The 4th accessible dungeon in the version 0.2.X of the game, the central tower "Razarac Tower", is not one of the dungeons that can be completed; it currently serves as a transition between areas. It will only be possible to complete it towards the end of the game's development, but it should not be ignored because all its accessible paths serve to advance in the current version of the game.
There is one bomb bag accessible in 0.2.X; it's located near the beach to the west, and you can access it by finding a path through the maze of small purple trees in the central tower's garden.