Oh nice, the demo for this released the day after I completed the original. I left a comment/review there if you haven't seen it yet.
The demo for Fox Flux Deluxe is a massive improvement over the original in terms of graphics and puzzle design. There were a few puzzles that stumped me for a bit, though I eventually got wise to a bunch of sneaky tricks! In Manifest Destiny, for instance, I knew to immediately investigate the open wall to the left after discovering something similar in Green Behind the Ears. The cute dialog and interactions between Lexy and Cerise are a bit more sparse, but they're still great as usual and I'm a fan of even more characters being thrown into the mix. I still love all the little details as well, the background of the results screen changing to reflect her current form, the way the grass kicks up as she walks around, the big explosion of clouds when she plummets straight through clouds as a starcow, her transparency when she's a slime, and a few others.
Anyways, after binge-playing the demo I managed to get everything. Maybe. I've got 17 treasure, 40 hearts, 2 stars, 5 completed drone minigames, and a gold trophy for every level *EXCEPT* Something in the Water. I didn't beat all the par times or developer times since I'm not really good at speedrunning stuff, but Something in the Water is still showing a silver trophy with 99.0% completion despite me getting 10/10 hearts and 371/371 candy in a single run. There was a suspicious-looking candy corn behind a wall of bees that I used an exploit to get by, but I was disappointed to find that it gave 0 candy and didn't help with the trophy situation.
Oh, and the exploit is that if you click and hold (or drag) the game window while something is in water, the waves will go wild when you stop. If this is done in a body of water that's large enough to swim in, Lexy will sometimes go flying when you stop. Also, this may be a "you brought this on yourself" kind of bug, but if you start the game without an audio device (I don't just mean a muted audio device, I mean none whatsoever) then the game crashes when it tries to display dialogue.
(EDIT: You can also use the exploit to make Lexy fly absurd distances if you use it when she gets hit. I did this to get the star in Manifest Destiny. Sorry, but that star is EVIL.)
I'm looking forward to the full release, whenever that may be!