This is a cool looking concept!
Some thoughts:
- In the main menu, when going to the section "How to play", the main menu itself is still reacting to the position of the mouse (making the mouse-hover sound effect). The functionality is fine though.
- After an action (like building) it would be nice if the selected tower was deselected by default. It felt a bit cumbersome to build and select.
- I love the aesthetics of the main menu, with the neon borders and all. Very fitting!
- One punchy melody in the main menu, and another one more calmed in the actual map would go a long way towards immersion.