Hey Kosterix,
Thanks for playing the game and your feedback. I'm currently remaking the game from scratch, since I lost the source files and hadn't kept any backup ( I was an idiot ). I'll definitely try adding colors to the wave trails.
You're right, the core mechanics aren't really that intuitive. Perhaps I should add a small tutorial in the beginning of the game.
I'm also experimenting with more mechanics, like collectibles and stuff. Your idea of adding a reward for a certain number of blocks avoided is good. I'll look into it.
Thank you once again for your time and feedback.