Thank you for the feedback! and indeed, the game has some optimization issues, it ran even slower before posting it for the jam. and the x button refers to the xbox gamepad, altought i'd agree that the information is not very clear, and enter for shooting was made because it is more confortable for changing from coding to testing the build, but for actual gameplay it is kinda weird, that and other stuff will be different in the next patch.
and Thanks again for the comment!