Just uploaded a new build where you can use the arrow keys, WASD, or moving the mouse to the extents of the screen to move the camera around. You can also zoom with +/- keys. I hope this helps!
I like your explanation of the increase of rates. I know there is definitely a flawed money surplus right now. One thing I've been wanting to add is a tech tree, which users would "research" new upgrades from. This would be both a time and money sink. But I haven't quite got there yet.
Your way of slowing down the progress might be even better. I like that you have your own way of thinking! :)
Also many thanks to uploading moving the screen with keyboard. Now I can admire whole design! It is one of the best games I have played recently. Of course it has many ways to improve, but general overview is very good!
Unfortunately I have spot a bug: when you finish the game, you can choose between finishing the board (quit) or staying (resume). If you click resume, the screen stays dark and you can't play any more. (you have to quit anyway)