A good game, enjoyable and relevant to the topic. I didn't find any critical bugs or errors. There are some minor changes, in addition to the previous comment, that I think are worth making:
- close the leveling menu with the Esc key;
- add anisotropic filtering to make sprites smoother;
- make the bottom layer of water (which is dark) static so that the direction of the character's movement relative to the bottom is clearly visible;
- add a collider for enemies so that they do not enter each other and the player.
These small changes will make the game even more enjoyable. Overall, great job!