I would avoid blue text on a black background. That's never much fun to read. I know you want to preserve the black background because of the graphic, but black text on white is better, IMO.
If possible, I would also change the 20% health and attack boost <select> inputs to checkboxes.
It would be also be neat if you added cookies to save the equipment and research levels. Do you know php or something similar? Easy to implement with that, for example.