Scarescraper is pretty disappointing, simply not as good in this game. Aside from inferior gameplay and lesser ghost variety, there's also the way the mode is structured, namely 10 floors is the highest you can go and the mode is always random. After beating the 10 floors, there's no reason to keep playing it. In LM2 there was a completionist aspect where you can beat each mode on each number of floors, and you can catch all the different boss ghost designs. It also contributed towards getting upgrades for the main story.
So far, I'm really enjoying the game. Collecting money is really addicting, and I really enjoy the bosses and rooms. Not to mention the controls are a lot better than Luigi's Mansion 2. I do wish the rooms were darker (I love that in the original Luigi's Mansion), but this is probably the best Luigi's Mansion to date. I still never beat Luigi's Mansion 2 because of one of the difficulty spikes at the end. This game seems to be a lot more reasonable in that department.
Great to hear, and perhaps you'll be happy to hear that you can turn the brightness down via the in game settings which I highly recommend.