Thanks for the feedback. I would advise to play with a controller since it works better, although keyboard should also work. You can dash down by dashing while steering down.
Ahh, you played 2 hours ago. There was a bug where the new input system causes the player to keep moving, even when buttons are released for keyboard. I only tested with a controller, but a friend pointed this out to me. By adding 1 line of code I was able to fix it and uploaded the fixed version at 14:30. I still prefer a controller though ;)