Don't count on your first product being a success.
Have reserves to handle a few less-than-break-even projects.
Have more than one idea.
Start simple.
Remember that you have to release a product every 2 months to make a living at mobile.
Never go into debt and your company can survive forever, even if you don't make a dime.
Make a code base you can reuse. Know who is going to buy your product.
Don't underprice.
Make sure your contracts always handle things like your publisher going out-of-business.
Only make products you believe in.
Don't finalize your company name / product name until after you have successfully registered the web domain.
Keep your fans talking with forums.
"Lore" is a super cheap way to make your game more interesting.
Be extra kind to the folks who aren't getting paid... yet.
Don't burn bridges... you never know.
What is hot today will be dead tomorrow, no exceptions.
Be sure to have a bloody good screenshot or nobody will buy it.
Find "movements", join them, take them over, make them yours.
Always innovate, never follow.
Notice targets of opportunity.
Polish, polish, polish.
Eventually, you have to ship or die.
Somebody has to be "the last word".
Better yet, don't do it.