Probably the most polished entry I've played so far - I loved the artwork and how the different ghosts moved in different ways (damn you blue ghosts!). My only comment was I felt like the vacuum should have a power bar or an overheating mechanic or something - I basically ended up just holding the mouse button down at all times, which made it feel like the vacuum could have just been on all the time by default. I think preventing that would add a little bit to the challenge.
Overall a really amazing entry, well done!