May I suggest a way to change the background color? For color deficient people (can't speak for full-on colorblind), it's difficult if not impossible to tell the blue currency text from the black background.
May I suggest that when you have the options x10 or x100 enabled, to only highlight the buttons when you can afford the purchase of 10/100 of the item?
I enjoy the game, and it's one of the nicer looking games like this out there, but I despise the actual game mechanics. I can't tell you how many times I've misclicked a square because my stroke wasn't as straight as it should be or I forgot which pen I had selected. I love the achievement/badge system, but continuing to make these mistakes until I actually unlock the ability to stop them just isn't worth it almost.
This is a great game, but I do think that a couple of changes would make it even better. First of all, getting a decent amount of money takes way too much time, even for an idling game. Secondly, some sound for the game would be great. Maybe an impact sound or background sounds, like birds chirping or owls hooting, or maybe even a background song or something. Other than those two changes (although, a way to keep the hairstyles and plants we buy would be nice, too), the game is perfect! ^_^
This is one of my favorite games, but it does have its downfalls. Firstly, the lag. I used to be able to run it no problem, but now I lag terribly. Maybe a toggle background button should be added to counteract the lag, if it'll help? Second, playing this game for more than about one chapter gives me headaches. I don't know if it's the (laggish) scrolling arrows or the flashing, rolling background, but it's definitely one or both of those. Third, I can see that the light coming from the crow's head is supposed to give us a hint, perhaps, of what the bird's reach is, but I can't figure it out... Other than these cons, this game is great, but I have to five a four because the lag makes it near impossible to play well.