Middle mouse button, sorry that this is not clear! Just click and hold the middle mouse button while moving the mouse. I will add some Keyboard controls for this soon as well.
Thank you for your fast response. Unfortunately I don't have any mouse with middle key around. :( I will wait for keyboard controls for that.
The idea of your game seems to be very good and relaxing.
For most of the incremental games, the prices of assets are increasing. They are usually something like: first new object is X, second existing X*(1+p), next X*(1+p)^2, and so on. This makes the game more challenging. You begin with little amount of money, building first takes some time, but then the game become easy. And after some time (and building more objects) you need much more money than it is available, and your progress is slowed down. Current state of your game is that starting is a bit challenging, but getting to know how to solve making money, you gain more than you can spent.
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)