itch.io

yes there's a walkthrough 

there's a rift where you should go with Mary (with her adventure costume on), then there just finish the route(there's a walkthrough available 

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purple pillars will dissapear after you finish lust route or the game itself i think not sure

two fingers in the screen results to a back/delete button, you have to hold one finger then tap with your other finger and it will result to a back/delete

The Ninja Elf guarding in snowy ridge. You can xxxx her after discovering other two ninja elfs "slacking" off in the castle walls(the castle walls are in the north part of the 2nd screenshot)