I wanted to write a quick review after I spent some time with the game, just in case anyone is wondering if they should pick it up on sale. I've spent about an hour with it, and it was very enjoyable.
I first became aware of the game from a screenshot, which showcased the cute, colorful, and stylized graphics. I think they work well with the game and they look great. I'm playing on a 280x, so I can't comment on how well it runs on lower cards, but there are options to turn off shadows, reflections, antialiasing, etc, so it should probably run fine on just about anything.
Cranked up to the max, the game looks beautiful. The style complements the game well. It even offers 1.5x-2x SSAA (Supersampled Antialiasing). I opted to just leave it at 1920x1200, but I found it interesting that they had such advanced features, especially since the game looks just fine with the standard AA settings.
As for gameplay, it's pretty much what you would expect. I've only experienced the first two characters, but their playstyles are different enough to make running through the same levels entertaining. The most surprising part for me was the speed factor. Particularly with Sophia/Miss Take, not only is there a par time you can try to beat, but the randomized guards and powerups really emphasize a quickness. This is definitely not a slow burn stealth experience.
Everything is controlled with mouse. Click to move, hold left click on the character to whistle, right click to throw items, and hold left click to run (if the character is able). I picked up the controls quickly and started to have lots of fun doing speedruns on some of the levels. Restarting is quick and painless, and the controls combined with the play make for a very arcadey type of fun. I could see this being a blast played with a friend, passing the controller on death or seeing who can get the fastest time.
The pathfinding, as I've heard mentioned before, does leave a bit to be desired sometimes (Sophia got stuck on a few edges), but to me it wasn't an issue. With either character, I quickly got used to "setting waypoints," basically, guiding them exactly where I wanted to go. This isn't the kind of game where you click halfway across the level and expect them to make it there unhindered. There are guards to avoid and paintings to collect.
Overall, I'm very happy I picked this up, and I recommend you do it too.
My only concern at this point is the difficulty (will it be too easy?) and the length. My (very quick) glance at the house hub makes it look like there are only 5-6 areas, and I've already made it to the second.