Nice one button concept; the idea of emitting waves at the right time is a good hook but I felt like it could be capitalized on more. In the current game, you can just spam space endlessly -- but you already have a smart solution to it, the blue dots! Only allowing myself to go for one shot kills made the game much more enjoyable, and nudging the player in that direction through some mechanics would add more depth. It's genuinely satisfying to learn the wave speed and align it with the enemy speed; gearing the game around that more would go a long way. The minimalist aesthetics and vfx are great for the feel of the game, and with just a bit more connection between the ideas here, you'd have a complete package.