Good feedback! So, you being on Linux shouldn't be an issue with the web build, so it has to be some other stuff going on that I will look into. At least, it shouldn't be anything Linux related...And good feedback about the tutorial, and the camera/controls. You are actually able to zoom in and out via the mouse wheel when hovering over the grid, as well as move the grid camera around with WASD or right click and drag. I don't cover that in the tutorial, that REALLY needs to be covered. As for the build section showing over the grid, yeah, this game 100% benefits from a large monitor. I personally have a 2k monitor (2560 × 1440) and had the game target 1080p (1920x1080), and at 1080p, you have to move the camera around a bit to see things when the grid gets bigger, but you shouldn't have issues anywhere near the start.
Hopefully that can help you some, but I 100% have some work to do! Thanks for the feedback!