Collision issue in "Surface" level

[omnicron-llc]

When I get to the boss of the Surface level in episode 4, my ship immediately starts getting pushed around/damaged no matter where I go on the screen; there's no visible source for the damage, and it continues until my ship is destroyed.

[KScl]

I wasn't able to reproduce this in either the latest stable version or current master. Could you check which version of OT2k you're using, and provide more detail as to how you went through the level? E4 Surface is one of those levels that changes later enemy spawns if you destroy (or don't destroy) earlier ones.

If possible a video of the issue would be appreciated, too.