I literally went to bed late to finish the game. Just great.
The only issue I have with the game is that I got confused on which blotch I was supposed to kill, so for a while I ended up killing anyone with a water droplet over their head, thinking that meant they were washing off the colours. Perhaps in my tiredness, I went on for much longer than I care to admit down that path, until eventually I thought 'hmmm... why does it feel like it's not really progressing properly'.
Fantastic job!