Such a stylish, clean entry! Reminds me of the old Railroads game on iOS back in the day, which I lost countless hours to. The ramp up is perfect to challenge without overwhelming, and even without checking the tutorial I could understand the mechanics whilst still being presented smart, brain-teasing conundrums. All of that's tied into that relatable and PTSD-inducing of themes: desperately trying to get power to your phone before it gives out.
Smart, clean and really well excecuted!