maybe it wont be understood properly *and english is not my primary language* but i think this is the "walkthrough" to get to the end without being caught
'''''''''''''''''''''''''''''''''''''''''''"SPOILER"''''''''''''''''''''''''''''''''''''''''''
also when you see the: "?" its because i think u can fill the meter without using the vacuum
there you go
2 stay - vacuum - stay until full - 2 stay - vacuum - stay until full - 1 stay - vacuum - 2 stay - vacuum - stay until full - 1 stay - vacuum - 2 stay - vacuum - stay until full - 1 stay - vacuum - 2 stay - vacuum - 2 stay - vacuum - stay until full - 1 stay - vacuum - 2 stay - vacuum - 2 stay - vacuum - stay until full - 3 stay - vacuum - 4? stay - vacuum - full - 3 stay - vacuum - 4 stay? - vacuum