I'm not a producer of music /electronic music but i know some DJS around Spain so I pick some sounds and mix with images to experiment with my creations, in effect the sound of my last videos is from Fatima Hajji DJ work music, in others i use Paula Cazenave and in others sounds of MOS DJ all of this artists are from Spain.
Your last gif have good performance on my master video encoder the only problem is the grey background tha appear to frame 0 to 40, because in each frame appear some lines on grey.
Yeah, We can remove grey color on Gimp but is tedious work, I put my eyes on F4L I think that soft can be help on some effects like appear - dont appear, but I'm not sure if is good to work with lights and path lights.
But at the moment is the only idea I find, Blender is very complicated for me.
Try to answer to your question about kdenlive or openshot, in all my videos I use Openshot and Pitivi (in some cases) Kdenlive dont be a good choice in my opinion because is a KDE part and like KDE need very resources more that 4 GB to work properly because this in 32 Bits systems or in pcs with poor recources like 1.5 GB RAM this program crashes constantly and the work he does is equal to the openshot , so openshot is better and more effectively.
In my works I use Gimp to images and backgrounds , then export it to png and then mount all in OPenshot with music and effects.
IN some cases I use some little scripts like convert gif to avi or the command lines convert and potrace with this I can put any image by , .jpg, or .png and other formats to svg and with svg I can manipulate the images special to enlarge or delete some part.