Your game looks awesome man, and you really nailed the movement mechanic. Fun fact we were also thinking of using an explosion movement mechanic but couldn't think of a way to make it fun to play, so you beat us there man haha.
My only real note, is that I am not sure if this on purpose. But the ramps half pipes communicated to me that you might be able to use your roll mechanic to build speed on them, but I guess the friction is too high as I still need the projectile to actually make any progress. Which does make the rolling movement feel a little redundant, but I can also see from a design perspective that's exactly what you want.
I also really liked the attention to detail that firing the projectile gives you a little boost as well allowing for some air control.
Really clever design and execution all round.