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Hi! Glad you liked the project. I'm not sure I understand your question. There is only one push button ("buttonPin" in the sketch) and a potentiometer ("potPin" in the sketch) to select the time. Those are the ones you can see under the display. Additionaly, there is an extra potentiometer inside to adjust the display contrast and a switch to power on/off the circut. I hope this helps!
Sorry there is no other link. You can download all files in a ZIP from github by clicking the "Clone or download" button :)
Thanks for your comment! The i2c module would reduce the wiring mess a lot, so yes it may be easier. But the sketch would need some modifications!