Yeah the cellphone controls are a pain in the ass. The p, page up and down buttons are really uncomfortable to use. You could change it so you can use the mouse to navigate the phone. Right click to open the cellphone, and to select the "apps" make it so that you can use the mouse freely.
Another suggestions:
Make quests to trigger and track the scenes.
Place exclamations or hearts where a scene it's occurring. Place them on important npcs too.
Create a gallery that gives you hints on how to unlock scenes you didn't see.
Make a tracker for the girls that shows you where they are.
On your status tracker (agility, charm, etc) show where you need to go to improve them.
Remove the cars on the road, they are really annoying while you navigate the map.
Make a guide if everything it's too complex to put on the game.
The game has potential, but it needs a lot of improvements. I know this is a lot, but I hope it helps you in any way.