Keep any Issues here and I will tell you if they are bugs/features and try to fix them and then release newer versions.

This could add to the custom colour palette and make each element more recognisable to the user

If you want to have an element, compound, mixture or reaction, then add a reply where your element is serialized in json...

This will be where I post different updates and what I have done with them.

Hold shift or ctrl or alt to select multiple (2 modes - all in between and all specifically clicked)

Add keyboard shortcuts for adding chemicals so as to not have to move the mouse from each chemical then to the add butto...

Add a feature to drag the chemicals about

Have better colour palettes

I think, when you click on a chemical, it should highlight it to show you have selected it. This would add to the design...