Just finished binging both Project Kat and Paper lily and I have to say, I'm extremely impressed. The art is gorgous, the puzzles interesting, and the story so far has me intrigued. I appreciate that puzzles have multiple solutions making the game somewhat non-linear. I really look forward to future chapters, and on behalf of the indie-gaming loving community I'd kindly ask you to monitize them as your hard work sofar deserves to be rewarded with something more tangible than praise.
I do wish there was a walkthrough or some sort of guide to this game as there are a lot of secrets, and there are some which I wasn't quite able to figure out just by myself. For example, I'm not sure where the key you obtain from opening the locked box in the bedroom is meant to used. I also agree with some of the other comments that the spike mini-game, painting chase, and Miss. Knive bossfight have somewhat jarring difficulty spikes. I'd suggest maybe also adding an option to skip the painting chase as I believe the ability to skip the spikes/bossfight remedy this issue.
Otherwise, thank you so much for the time and effort you undoubedly put into this game. I thoroughly enjoyed it, and look forward to your future work.