I've got two beacons lit but things just start costing a ridiculous amount of oil with seemingly no way to significantly increase production. I guess each shore would be even easier if you could easily max out the oil upgrades every time but it feels... not great to get less and less oil unlocks per shore the more you play.
I like the idea of the game, the aesthetic and the different coasts' mechanics are interesting at first. A lot of the game gets trivialized fairly quickly in my experience, just put the light and the night shift option on auto, beam set to signal and let it rip. Oil for the beam quickly stops being a concern, though reducing beam power doesn't get you significantly more oil.
Seems like fairly quickly you're just kinda waiting on day/night changes for the oil production to unlock, and then waiting for the oil to produce.
Maybe I'm just powering through it too fast and you have a slower burn/more idle type of feel in mind though.