Hello! so sorry for the inconvenience, this game is made to be played on controller, but if you don't have access to one I could tell you the controls here:
E is for gliding
While gliding you can press a couple of buttons to enhance the gliding experience, like:
W - for diving forward
S - for pulling upward
CTRL + W - for diving down faster
Q - for slowing down time
Thank you for the comment and I hope you give Bardo another try!