I thought this was a really cool concept! The sound design feels super nice and the art's clear and readable - I especially liked the additions of the light hum throughout the entire game, it really instilled this feeling I'm working in some sort of high tech lab. I think my greatest critique would be with where the atoms spawn - sometimes they'd spawn right in your atom and cause you to instantly have a crash, and other times they'd spawn so far away you'd have to spend a good chunk of time just waiting - which felt rather tedious in the earlier stages where there wasn't much to do. This is a small thing but additionally, when the second nucleus first came in I had read it as an "enemy" nucleus that I want to absorb the atoms I was trying to get - it wasn't until I kept trying to get atoms with my previous nucleus and they'd zoom straight by me that I realized the other nucleus is also mine. I wonder if some kind of animation to show that the bigger nucleus is "finished" would help clarify that. Overall though it's a super well done game! I enjoyed playing it alot.