I am still working on OutOfScope about once a week so progress is a little slow but still interesting to me. The latest update introduces audio and particle color blending which are prototypes for two of my three milestones.

A bell will play whenever particles bounce off the green bouncers. I plan to expand this by having each level play sounds repeatedly to gradually form a soundtrack. Playing around with sound is fun although I also see it become a little noisy in the long run.

If red and blue particles collide they become purple and any particle that hit a purple particle becomes purple. The goal only consumes particles of a matching color. Since the levels only has red goals now, mixing colors does not help solving the puzzles. I expect to have some levels where initially colors will be mixing and make it possible to avoid this by redirecting the particles around each other.