Thanks! I use Inkscape to draw, sometimes I animate using Synfig, but in this case did frames in Inkscape as well. Screen in this blog post https://smjn.itch.io/dcd/devlog/624159/day-5. I usually do all in white with shades, then tint the sprites in code. The engine is something I created based on PixiJS and make scenes in Tiled. Indeed, if I develop it further, picking and dropping would be worked on!