I really enjoyed the abstract styling, playing a mouse collecting cheese but fighting micro-organism made me laugh. Weird and charming, yet fast paced and fun.
Once I realized that I was moving slower when shooting I liked that balancing. Do I stop shooting to zip past some enemies, or do I shoot them instead? Love when a game has options.
I think the game could benefit by some form of score or progress on screen, indicating to me what goals I have accomplished.
Well done overall!