Confirmed assumption about having too many living robots: ran around invisibly
without a weapon equipped, triggering the creation of many robots, teleported to
the town, waited until respawn => 5 messages: "There was no free waypoint found
on level 53 to place another random bot." So there is no way to "overcrowd" a
level so heavily that winning the game would become impossible, if the "obstacle
issue" is also solved: the game should not crash when that happens. Then you can
always level up / buy books/enhancements, and clear the level slowly out as a
last resort if you have made the mistake to trigger the creation of too many
opponents.