Looks great, information layed out well :)
Great to see someone with set goals.
And I wouldnt worry the slightest about performance.
You made a choice for desktop systems, which, with modern recent hardware, should generally be able to handle a game ten times your load.
Seriously, your game is relatively small, < 50mb , and your imagery is not heavily detailed (lots of black stuff), it should run fine on most modern mobile devices too.
Love the theme / coloring approach