Good suggestions, and easy enough to do, so I will fix. I'm being to think my laptop screen is too crisp. :/

Edit: Oh, and I should point out that shadows would likely being a programming thing.

I partially agree. I zoomed in 3x right away, and I think its OK magnified, but in 1x this could be an issue. Although could work that way too if animated.

I agree with adarias. It's a problem that you might want to fix. I think that you ca fix the problems just by looking at some mockups of adarias himself, caus eon those mockups youll have to be blind not to see the characters. But well, nice work, although it's hard t see what is what in this mockup...

agree with adarias.. Probably add a dark outline and some shadows.  

this is where those readability issues really kick in - characters are practically invisible by gaming standrads.  all of the work is very nice, you just cant see any of it

best beautiful I am with adam once but still what becomes better and then I think that tie perfectly are

All your characters are soooo adorable! The mockup looks a bit strange though without cast shadows.