Hi, just downloaded the latest version and it's a big improvement from last time I checked it out! Loads really fast and has plenty of functionality for creating assets without unnecessary features.
One thing I notice about a lot of paint programs is that the mouse wheel scrolls up and down the page by default. That is fine for text editors, but for editing images, zooming with the mouse wheel is a natural and intuitive way to navigate around an image, pinpoint a spot to focus on close up, quickly zoom out to get an overview of how the whole image looks while working on a particular detail. Having to hold ctrl to activate it takes away from that natural responsiveness. It would be interesting to know if other users disagree and find scrolling up and down works better for them? At the least, I'm sure it could be a toggle option in the settings menu.
On another, and almost linked idea, It would be very useful if holding down ctrl would enable the color picker. That would allow you to rapidly pick various colors from the image to make subtle changes.
Last one.. shouldn't opacity be an attribute of the paint brush tool, rather than the selected color? Because if I'm using the paint brush to apply a consistent low opacity amount of various colors (which I do very frequently for building up an image), I have to keep resetting the opacity of the color after using the color picker or the palette. Most graphics programs seem to have opacity as a tool attribute.
Please look into these topics, they're not major changes, and would greatly improve ease/speed of use.