Thanks for playing and the feedback.
We are continuing to work on this game, and it will be getting regular updates. The movement is slower to respond at the start, as you are meant to purchase upgrades for your ship, including the engines. Engine upgrades increase max speed and acceleration. We have the mouse set to fire weapons, so don't currently plan for any movement to go towards the cursor from clicking. We plan to add a short tutorial to the station, similar to what you get on warping to the first dimension, to help new players get going.
I was able to click on the X button, and use keyboard with it, on both the settings and credits screens, and have it close. What browser/OS are you using? Did it show the hover effect when you moused over?