Hello! Me and other students in one of my design classes are looking into the users of Pixel Dungeon and similar games :> The survey is completely anonymous and takes ten minutes or less, and the more people who fill it out the better data we'll have! If you want to know more feel free to ask, I'm nice >.>Thank you! https://goo.gl/forms/GYvacvosMUANN9Q42
You should also try posting it in https://www.reddit.com/r/PixelDungeon, you will find some research subjects there too for sure. Also I think that generally it is considered good academic practice to mention the academic faculty and also the purpose of the research. Wish you the best for your research!