At great speeds collision with walls may get you stuck within the wall. I think it should either bump you out or damage your parts which would be reasonable giving the fact player just ran into a wall at mach 1 speed.
PS: Dominas, the DD22 game version has disappeared from your profile and requires password to access now. If you hid it intentionally, does that mean we were not supposed to access and test it? If you feel that it's too close to complete product state to be a demo anymore, we will understand.