Fun tip: To return quickly to the top of the map, press the question mark at the top of the screen then press the space bar. This will instantly teleport you to ground level, where you can teleport back to the spaceship.
My problem with this is the same as the first one— it takes so long to get to the end, that when I die fighting the boss I am unwilling to try and get there again.
I'm not getting the achievement for finding 1k with of stuff. I've already beat the game several times, does anyone have any solutions that have worked for them?