Anyone have mobile game dev tips?

Hello everyone!

A few of my friends are interested in making a mobile game. While we are not ready to reveal what it is yet, I do have some questions on the process of making a mobile game.

I have been trying to get a mobile UI setup working. The way I have been doing this is by uploading an html5 build to itch.io and then testing it on my phone. The game window and UI seem to scale strangely when I do this (like lines in the tile map). What are the best settings to use for the HTML5 build to mimic a mobile build?

Bellow is the current UI test I have. Note how some of the UI such as the right joystick is off screen.

Other then that, I was curious if anyone had any tips or advice on making a mobile game. I have seen some documentation such as this link on how to do it for ios ( Defold development for the iOS platform ).

Thank you!