Cool game! The idea is cool and it's well implemented. The visual style is unique and interesting and it looks decent. It's very satisfying to grow super huge and devour all the bacteria. My biggest point of feedback is that the giant enemy has an oversized hitbox and is very low-resolution for it's size. And the message you get when you're eaten is somewhat misleading which can lead to confusion when you die. But once you figure out it can eat you, it's fun to try avoiding it until you can enact your revenge >:)
Overall, good job!