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I recommend Knock Knock and Stay With Me. If you enjoyed Indigo Lake, you might enjoy it's precusor The Woods.
It's an oldie, but I think Dead Space on iOS is truly fantastic. Replicates the Dead Space experience beautifully and has a really intriguing plot. I enjoyed it even more than Dead Space 2 (which came out the same year, I believe).
Yeah, Knock-Knock ( https://itunes.apple.com/de/app/knock-knock/id797090553?mt=8 ) is great, and Dungeon Nightmares ( https://itunes.apple.com/de/app/dungeon-nightmares-free/id814718898?mt=8 ) scares the heck outta you. I also recommend: - Eyes https://itunes.apple.com/de/app/eyes-the-horror-game-lite/id631771776?mt=8 - Home https://itunes.apple.com/de/app/home-unique-horror-adventure/id656723874?mt=8 - Blood Roofs https://itunes.apple.com/de/app/blood-roofs/id497008717?mt=8 - Year Walk https://itunes.apple.com/de/app/year-walk/id555916407?mt=8 - Papa Sangre / Papa Sangre II https://itunes.apple.com/de/app/papa-sangre/id407536885?mt=8 https://itunes.apple.com/de/app/papa-sangre-ii/id710535349?mt=8 - The Nightjar https://itunes.apple.com/de/app/the-nightjar/id431598741?mt=8 - Maze of Darkness https://itunes.apple.com/de/app/maze-of-darkness/id671666006?mt=8 - Garden of Fear https://itunes.apple.com/de/app/garten-der-angst/id625214826?mt=8 - Rootwork (not a horror game in common sense (it's actually a card game), but can give you a very uneasy feeling... because of HER... http://appshopper.com/games/rootwork