Hey thanks for the feedback!
You can pause the game by pressing the ESC key.
About dragging, we noticed it is not working as intended on the WebGL build, we're looking into it. For now you can drag with the Right Mouse Button which works fine or download the standalone version available for Windows and MacOS.
We're aware of the size issues and looking on how to make it look better :)
Thanks again, we're hoping to make an update as soon as possible.
Have a good day!