I have played Rustbreaker, and written a review in which I describe my experience and give feedback on the game. Read it here.
I'm Max, one of the three developers working on Rustbreaker - and the resident programmer.
I seriously appreciate such an in-depth look at the game in its current state. At this stage, all feedback goes into a big spreadsheet where we can lay out everything that needs to be done, and how to prioritise it. As such, it is incredibly useful to receive something like this!
I'm glad you're very enthusiastic about Rustbreaker. If you would like to get more involved with it, message me on Twitter; we would love to send you more builds of the game!