Fairly simplistic game with a clunky UI, but it's short and whimsical, and the ending made me grin.

As a game-jam game, short and sweet. As a full game it needs some polish. Goals aren't always signposted well, and purchasing is mostly counterintuitive (elevation is spent and deducted, but negative elevation operates on a landmark system rather than a purchase system, except on spinners, which are autopurchased to fill up all available tunnel but only once you click to acquire them; and cables' elevation costs don't reset if you buy an upgrade which costs cables, except for the final upgrade which also can only be upgraded if you have more cables than you did last time you bought it). But the up/down dual mechanic is an interesting innovation so this still feels like a good proof of concept.