From pleased giraffe: When I wanted to buy fuel in outpost (I had a bit over 10k pixels, probably 11k+), I selected it in shop and clicked left arrow next to the amount shown. It's generally the fastest way to buy / craft maximum amount you can. Previously, under 10k pixels (around 5-6k), it just defaulted to 1000 and I could repeatedly buy 1000 until I no longer had enough pixels. With over 10k it remained at 1, while total cost jumped to my current amount of money. I confirmed purchase and only got 1000 fuel, while all my funds were consumed. Damn shady merchant. Edit: Rocket boots sound can still glitch and get stuck in a loop that doesn't end till you exit to main menu.