I'm glad it was a misclick! Thanks.
But actually, the game that was so hard was the first I published that I took down for that reason. But you have rated the fixed "Revenge" version that includes a bullet time feature to make it easier, and each match you lose the game gives you one bullet time more.
The mouse not centered I'm not sure what do you mean, when you click on the game the mouse gets into "captured mode" and you shouldn't be able to see the cursor. If you see it that's not because of my game but a security feature in your browser configuration that prevents webs from taking control of your mouse. Chrome for example asks you when it happens and you can click on "allow always on this site". Hope that helps! <3