I kinda wish that you could buy upgrades with the P.P. that would (for example) up the dye per tick by 2 or increase the effectiveness of a certain color, or hell, even a shop where you spend you P.P. on items or collectibles that give you minor boosts, like for 1000 P.P you could buy a zebra plushie that gives you 1.5x paint speed/dye per tick (or DPT for me) for white dye and 0.5x paint speed/DPT. other than that, its a 10/10 game. (I also wish that when you reach the final painting you get to like trancend and get a new set of paintings, or as mati6049 said, make it endless, or semi-endless)
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