Couldn't finish the game due to two bugs. One is the gravity upgrade: The first time I try the puzzle, I get the eight buttons down to two, then both are counted as wrong no matter the order. Trying the puzzle over will allow me to progress. Afterwards, when the Engines melt down and I pull up a puzzle, I get infinite "+30 Seconds", meaning that I only get that pop up, I was able to stack overflow the thing and now have +1 hour till meltdown technically.