"hey dude what if we made a coloring book but it was a game"
It's a very good concept, however I think the game went just a little long. I'd say 2 or 3 stages less would've done it better, because after long enough the gameplay does get a bit stale. The only way they really change it up between levels is by making it more difficult, which isn't really the appeal of the game. Kind of similar to Sonic in that regard.
I have no real issues with the game aside from the ink mechanic. Getting ink'd instantly throws off your vibe and sets you into a fast search for water. If there's no water nearby (or the game's routing system has you on a fountain that's horizontally near you but vertically too high to reach) you're screwed. It's a really weird 1 hit kill mechanic