Very neat game, though I feel like the level difficulty is unbalanced. Some levels make me think I have no idea what to do, some levels are just fooling around until I get a tumour that floods the entire level (though those moments are somewhat fun, if not very puzzly). Maybe this would work as more of a sandbox or a zach-like optimization game rather than a classical puzzle.
Another note: The art is not bad but I felt the pixel shading was messy and made the game feel poorly drawn (there's not enough pixels to do random dithering), your original sterile vector graphics (as seen in your video) weren't so bad this kind of game. Personally I'd stick with the pixel art but I'd use much simpler maybe even single colour blocks with symbols painted as is.