Two things that you can improve are:
The game doesn't save your progress, so you have to start over every time you come back to play, and the text money i found is a bit difficult to read, maybe you can give it a white box.
Great game, but can you change or make a option for the mouse instead of having to press the C to change pencil you could use the right mouse button to change pencil?
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 "Pixelo"){kind=icon}
That's great idea. I'll apply one of you guys great idea. Thanks :)