Sadly I could hardly play it, since no fullscreen button was displayed and its chosen resolution was almost twice my screen size. I'll not rate this for, since I can't give any informed opinion, might try again on the other PC witha larger screen.
thanks for trying! one thing you might be able to do in your browser is hit [Ctrl -] or [Ctrl MouseWheelDown] to zoom out.
(I also just added a Fullscreen button, but i think it may be inconsistent with gamemaker. I need to do some research on scaling to the window size for html5 builds.)