Yeah, this is kind of possible with https://github.com/jwunderl/pxt-scaling which gives a block to halve the size of an image - not a complete solution, but if someone wants to might be useful to start with / could build a zoom out 2x type of block by applying that to all sprites. (Eventually I might be able to move some of the calculations to c++ to improve perf, but maintaining performance on hardware might be a challenge even if everything is implemented properly – would need to test)