This is a really good and simple game! However, my main issue lies in the sad lack of the finished echo mechanics. The concept of the echo mechanic is really cool, but it's unfortunate that it wasn't fully implemented. Without its completion, I find it difficult to rate the game more positively. Nonetheless, the gameplay is simple yet fun, and it provides an enjoyable experience.
One area where the game could have improved is in the inclusion of music or sounds. Adding audio elements would have enhanced the overall enjoyment and experience.
Overall, this is a decent game, especially considering it's your first project. It shows promise, and I encourage you to keep going with your development. It would be great to see how the game evolves and incorporates the intriguing echo mechanics in the future. Good job!