The look of this game is what jumps out first- it looks so polished and pretty, it's incredible! The sound design and music also have a basically perfect level of polish, and those elements look like they come out of a fully published game. Unfortunately I found that the mechanics left me feeling quite useless & helpless- my slowing down of the bacteria didn't seem to make the T cells and macrophages kill them any quicker, and I didn't manage to beat the first level before the bacteria inevitably multiplied out of control. Even when I froze all the bacteria, they seemed to just multiply in place before they could be killed. However if one of the game's focuses was to communicate how the immune system works, that was definitely achieved, as the roles of the cells are made really clear. It does seem to put the player in the back seat though, as it feels as if I'm relying on luck for the cells to take care of the bacteria themselves.
Either way, really great concept and beautiful design, well done!