200k is actually fairly good, for something not AAA. I'd be extremely happy with that.
Most people get surprised when they see just how few sales it takes for a regular item to be considered a best seller.
In books, the New York Times Bestseller list can be achieved 5000 sales in a week, easily (Edit: with a big enough marketing push, potentially) achievable by picking a week that isn't shared with big name releases.
On Steam you can be a Top Seller with under 1000 sales in a week, as long as you don't launch on a week where a bunch of other hugely popular games all release major content.
Granted, it isn't easy to get a thousand sales in a week without spending millions in marketing. It is also fairly hard to cross the six figure (100,000) sales threshold unless you've got some serious backing and enormous funding.