I like it! The filters make for a simple yet convincing glitch effect even with the basic block generation algorithm.

If you would like to go an extra step to make it look even fancier, you could try introducing some more block variation (e.g thin lines, squares, rectangles) that could be done with noise based tiling (e.g simplex/perlin). Throw in some RGB shifting and image cropping for some of the blocks and you'll probably get something real nice.

I implemented a glitch effect some time ago using what I described above, you can see what it looks like (under glitch transition). Hopefully it can provide some inspiration :-)

https://aeroheim.github.io/midori/