I want to like it, but holy crud, this game is just unplayable. Not only is it too fast, but we get zero breather the moment the game starts. And it really doesn't help that I literally have to use my mouse to click the start button, meaning I need to take my right hand off my keyboard for a game that requires fast reaction time.
I don't really like doing comparisons with other games, but I made a similar comment on RunTime, where I have to use my mouse, and I'm immediately sent to the level with little to no warning while my right hand is still on my mouse. The difference is that it excels at increasing difficulty gradually through smart level design, which makes the issues slightly more forgivable cause it's at least playable, not impossible at the very start.
If you want to actually make the game fun, I suggest you consider making the speed gradually go up instead of immediately chucking the person at the speed of light. And as much as I want to appreciate the retro shader, it's very distracting.
Next time, test your game.