i like the island to the left, but there should also be some way to recharge batteries because i almost lost any way of getting back home, also the science ending would be cool if in ended with digging out the spaceship and repairing it.
You can recharge batteries at the power plant, but you should be able to survive without power (most places at least have a stone pickaxe). There's a lot more content after the "end" of the free version in the early access version, and you are eventually able to build a spaceship (the crashed one is pretty big, but we might let you build that late game too).
Stand next to the tablet, where there's shadow, then hide in shadows when the guard is not looking at you.