Small changes + released some project assets

- Increased the size of the game (this also increases the resolution of the animation).

- The background colour can now be changed by right clicking on the colour picker.

- Small change to the sliders to allow for a slightly wider range of customization.

Also, I have uploaded the GameMaker scripts I made to help make this little project. You can find them here: https://crinklemeyer.itch.io/gamemaker-shape-draw-tool