Hi, dear dev, an option to disable timelimit is needed, you know what? when I play this game I really enjoy helping people, yes I don't think it's a store that about sale or money, I feel it's all about help and feeling, a emotion, a mood, happy, slow, no pressure, I can just left the game there then drink some coffee and then go back to continue to help people, or just stop move and just see screen just see it with noting to do, I don't care money I don't care level, what all I care is this feeling......
Your special graphics and animation and gameplay makes these feelings.
So I recommend to add this option, and more better is adding an function to open/close store to makes more freedom and more real feelings with no level ( I mean, when store closed I could still move in store and chose a time to open store again, not mean the screen turns to black, but mean real, freedom, seamless experience), and, we can thinking more things, like a special people say thanks to you after you help a special people many times (if you give that guy a name then when that first happens, believe me some players will be very surprise).
I love a game like above, simple, happy to help people, freedom, no pressure......
BTW, when I first played the game I didn't realize it's a store untill I noticed the money number, before that I thought it's a ...some service without money needed.
Of course maybe you need more levels more elements to make the game becoming more rich, but may you consider my suggestions, add some options to have possibility to trun on/off those gaming function.
Sorry for my English if there's somewords couldn't understand just let me know. And, I really love this game, awesome for me. :D