All the icons are very distinctive and clear on what they do and the colors make them pop without stabbing your retinas. Perfect.
Feels like the mid-2000's was the peak in software UI design and it slowly started going downhill afte that, with companies chasing the soulless corporate mono-chromatic flat design inspired from mobile devices where you have no idea which UI element is a button you can hit and making you always hunt down buttons instead of instinctively nailing them every time with your peripheral vision because now all buttons are monochromatic and just bend together (look at your current browser's toolbar for example).
[1] https://upload.wikimedia.org/wikipedia/commons/6/69/Krita_1....