Thanks, and you’re absolutely correct! I ran out of time for:
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The connection mechanic - the line of electricity between orbs was supposed to power switches on the wall. The switches would, in turn, open gates blocking your shots. So shooting the orbs in the correct order would have been part of the challenge in levels.
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An ending - The last level (empty room) just repeats forever (with the background getting more and more broken because the texture resolution is non-power-of-2.