Why can't I use the tree improvements in the demo? How is leveling up supposed to work?

Every ship ran away after refueling at the town and I was unable to attack any of them. Problem is, the game autosaved me with 120ish fuel between my attempt to get to them and my next attempt so there's literally no way to reach any of them after that without redoing the tutorial. Annoying....

I don't know if is just me but the load times are too slow for the first time you encounter something new(slow shader caching?), i can play Skyrim and Warframe perfectly fine(stable 30 fps) and Starbound Linux(60 fps) on my laptop low-mid tier. I completed the prologue and played a little bit after the reset.(Played 2.4 hrs) General Feedback: Fuel consumption is too high, you could potentially softlock yourself. Either reduce the base cost or add an upgrade. You could add consumables too. ...

При выталкивании врага за борт он не падает а стоит, то есть он за бортом не атакует и отмечается как живой.

And why is it the same as Across the Obelisk?