This is a fun demo, I've wishlisted it on steam =]
That said I do have a couple requests/notes...
First, I'd like the ability to move placed buildings. Right now I can only swap them. So I'm stuck with however many buildings in each column as I'd put there originally.
Second, I've gotten to an odd point where the bulldozers are coming back to the Maw nearly empty, even though the amount of gems/ores waiting to be picked up is overwhelming. The physics on the gems is so slow, and the speed on the bulldozers is so fast, and they are all traveling really close to each other... Almost nothing gets picked up, and meanwhile more gems are added, so the gems get slower, and the bulls pick up even less. It all just feeds back into itself.
If the physics wasn't linked directly to FPS, or I could downgrade the bulldozers, or the bulldozers were spaced a bit more apart this wouldn't be happening.
Even so, it's a fun game, and I look forward to it's full release ^^
You can move buildings to an empty slot without swapping since the patch that came out 14 days ago.
And the patch 4 days ago increased ore physics among other things, intended to make the bulldozer/runner issue you're talking about a bit better.
So it seems like you should really download the latest patch hehe! :) The saves carry over automatically. You can also follow the game here or on discord to get a notification when a new patch releases.
Thank you for the feedback and wishlist!