Thank you for review. The first two comments are known issues. Colored direction, encrease spawn-rate and power-ups are good ideas. I will think about it.
Currently I have a plan to publish a lot of MVPs in short time to learn. Now I switch from Godot to Unity. Here is the link to the next game: https://marleeeeeey.itch.io/delivery-driver.
My plan is create 10-15 MVPs in different engines and genres and then start a big project from scratch or continue one of the MVPs. That is why I am not going to improve this game now but I wrote down your ideas and will use them in the future.