-Aesthetic is great, very cute.
-Painting is fun, though it feels kind of odd how small the physical lines you draw are. Makes it a lot less expressive than the huge paint blobs make it seem. [later] nevermind, I see that it was just a limitation for the tutorial. That said, it feels a little lame that all colors of line do the same thing. Then again, it would be annoying to cycle through them as is.
-Spike level is quite good, how at first it looks really hard but then you figure out you can just make a sled to ride the sea of spikes.
-On the contrary, the level after with the springy paint is weird. I don't really know what I'm supposed to do to get enough height for the 2nd hurdle. To get past it, I did some hacky method of pushing the big paint can down, placing a spring on it, then making a 2nd spring midair and bouncing on that to make it over.
-Floaty paint was alright, but it felt a little odd since you can't close loops, so my bubble almost fell apart several times while descending.
-Got past the first button level. I will say, it'd be nice if there were some UI to tell you how much ink you have, so you don't have to experiment to know.
-Got to the next level, is this the first time where you can have 2 full lines? If it was in a previous level, I didn't notice. This should definitely be more obvious. [later] I replayed and it was shown off in the 2nd level, woops guess I wasn't paying attention.
-Would be nice if the restart animation was uniform length, so it doesn't take so long to restart if you're far from the start.
-Level with ruler, it wasn't obvious at all that the dotted platform only interacts with paint lines. At this point I stop, I can't figure how I'm suppose to catch then move, or else launch the big paint can with only one line.
Pretty good puzzle game, it could just use some UI, main menu, etc. Biggest thing that felt odd is how you had to just test the paint to see how long it is, how many you can do, and what special property it has. It would be nice to be aware ahead of time, though I assume each of those types will be their own puzzle set.
Keep up the good work.