The game is not built for mobile devices. Even if it runs, you may not be able to do all the same things you can on computer, and the experience may be worse overall. Though if it works for you then go for it!
By the “it’s me” secret you must be referring to the It’s me images rapidly flashing right? The odds of that happening are 1 in 1,000 every second, just like how it is in the original game. It’s very unlikely for this chance to succeed multiple times in a row, so if you’re constantly seeing it, there may be an issue with the game. I’ll do some testing later and take a look.
The saving system is quite simple. On the main menu, at the top left, you’ll see a save date code with multiple numbers. This code represents the amount of progress you have in the game. All you need to do is copy that code when you’re done playing, save it somewhere, and when you open the game the next time and the game prompts you to input the code, simply paste it in and the game will automatically load your progress. Also no worries for any bad English. Thanks for playing!