I saw that you were really starting to ramp up the development of Fox Flux Deluxe, so I decided now would be a good time to check out the original.
Overall, it was really nice! All the dialogue was very teasy and cute, and I especially liked the variations of dialogue depending on what form Lexy was in. Even the one-time boss "fight" against Lop had different dialogue for rubber, slime, and glass Lexy! Another detail I enjoyed was Lexy's form persisting between stages rather than just turning back to rubber the moment she left a stage, as well as how it was used for a couple puzzles. The animations were all also really nice and fluid. My favorites were the slimes, especially that effect where it looks like her tail is flinging slime around as it moves back and forth, though I might also just be biased towards slimes.
One beneficial side effect of the phone that I noticed is that it's a very at-will opt-in kind of system for (a lot of) the kink stuff. Lexy still gets turned to stone and goop and such if you wanna beat the game, but you only see the kinky teasing if you go "Yes, I want to see Lexy teased about being turned to stone and goop and such."
I think my only big complaint would be the lack of the ability to look further in certain directions. I could see the attempts to resolve this by placing certain tells in the stages, like that one floating stone block in stage two of forest world that indicates where you need to jump down, but there were times where the only way to proceed was to make a leap of faith. It usually worked out alright though. I was also able to partially resolve this by tactically increasing the window size, which was comical and useful, but probably wasn't intentional.
I was able to get 104% completion as well as the mystery key. As a challenge for myself, I also went back and found the perfect route for stage two of forest world (getting all 25 hearts without restarting). It took me about three attempts and some note-taking, but it was pretty satisfying to see that it could be done.
Anyways, I'm looking forward to Fox Flux Deluxe whenever it comes out!