When the bug happened, you could still see the ship? Were you doing something like jumping back and forth between sides? Part of why there’s so little to play is how much I time I spent making the rotation work, I thought I got all the bugs but apparently not, sorry! I really appreciate the bug report, hopefully I can deliver a real game in the future.
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Yeah, the ship was still visible - as I recall I was entering from the top, and the barrier that the ship "hopped" was a jagged diagonal line from the top right down towards the bottom left. I ended up below the line. Prior to that I was exploring using the left-hand-rule doctrine to discover, to my delight, that there were more than six "faces" to the cube.