We've been polishing the gears and oiling the pistons. We've put together a standalone demo that lets you play a run against the machine. It'll be released... soon!
The demo features the key mechanics of the game with a limited number of tubes and store options. It'll be similar to what you'd experience with a first run of the full game, before unlocking more features.
We don't have controller support yet, but as soon as that is in the full game we'll release a new demo. We're committed to keep updating the demo as the main game progresses. It'll always represent a sneak peek of the current development version.