Let me give you some feedback:
The game is too slow. As in way too slow. After just a couple minutes of playing, I got to 1000+ points while the image/animation is only at stage 7. It is going to take absolutely forever for it to slowly advance while the player has nothing to do but to wait.
Also, since there are choices as to what you want the painting to do, you obviously miss half the content. In that regard, either make more stages where whatever option you didn't pick is added as a choice in the next stage or add a gallery where whatever you choose, you still unlock both animations. Expecting players to beat the game twice to see everything is kind of evil considering the first point that I made.
Also, I really like the puzzles but maybe add more tile types. Like you could split multiplicative and additive into two types and let both make the number go down. As it stands right now, you have to cycle through all additive and multiplicative tiles to get to the 1/2 tile which takes so much time... Maybe make the puzzles harder to compensate idk.
Aside from that, interesting concept. I am looking forward to what kind of content you will add in the future.