You don't need to hold the space, only to throw things which in this case isn't used for anything rn and you can glide in the game by holding the up button or the w button it says it on the controls section, seems you didn't see the controls that well or that you confused them. Secondly you can exit from the controls just by simply pressing space or enter,you don't need the mouse for anything.I thought the game was quite easy.At first i wanted to implement controller support but i didn't have much time