Oh, I see. :) A year ago I tried an experiment with one of my other apps at $2.99 and there was some review backlash. Perhaps it's worth testing the waters every once in a while. My general strategy has been to price to keep the rankings up (for discoverability) and keep the price where it won't be a factor in user reviews.
Sometimes lower price points draw negative reviews and higher price points draw positive reviews simply because the price itself sends a signal about quality. Higher price points may also result in more profit -- by reducing the costs associated with support (and the entitlement that a $0.99 app comes with). Have you thought about $4.99?
$4.99 would be to high. That price range is right for apps like Snapseed (pre Google aquisition) that are billed as serious photo editors (tools in genreral can command a higher price.)
When you are at that price range, it also helps to have a lot of big published reviews behind it so customers can evaluate the purchase more easily. Popsicolor doesn't have any of those, and probably won't receive any, because it doesn't solve a particular problems other than being fun unto itself.
