Your game is the kind that doesn't even need a tutorial because it's so intuitive haha, and that's fantastic! Games like this naturally immerse the player without relying on lengthy instructions, text boxes, or constant guidance, which makes it clear that the overall design was very well thought out. No matter how simple the concepts may seem, they still need to communicate themselves clearly to avoid confusion, and fortunately, you nailed that aspect really well.
The game's difficulty is fairly approachable, and its core mechanic is easy to grasp, which makes the overall experience enjoyable. Of course, the sound design also contributes a lot, as it blends very nicely with the visual aesthetic, which undoubtedly gives the game a strong sense of identity.
Since this is a game that requires precision when shooting the rats, it becomes noticeable over time that the hitbox of the projectiles is larger than what we can actually see on screen. That's not necessarily a negative thing, since it helps the player deal with the rats more effectively. However, it's also worth being careful with that balance because, if the hit area becomes too generous, it can have the opposite effect: instead of making the player feel skilled, they may start to feel like the game thinks they're bad and is giving them extra help haha.
Overall, it was a fun and interesting experience. Congratulations on the project, and I wish you the best of luck in the jam!