This gameplay is a fun twist on the "Clicker" types of games, which I enjoyed a lot. Chaining together loops of pixels is a great idea on allowing auto-clickers without just handing them to the player, cool concept!
The dramatic prices increases along with the tedious nature of placing single pixels was a little annoying though. I also wasn't sure when victory would've been declared, but it would've taken a long time if it was the whole screen. Being able to remove pixels would've saved me a lot of trouble not being able to understand setting up a loop the first time.
Regardless, good concept, executed well, no major bugs, and I had fun.