I like this game. It's cute. It's good so far I can't wait to find out what else you introduce. Might I suggest upgrades for clicking. I've found I only get more from clicks when I buy more production.
r is commonly used for restart, it is also down in the instructions section. But yes, an in-game help menu will most definately be made in my next game. (and i may even add it to this one as part of figuring out how to make it work)
Good idea