Hi. This sounds right up my street, I'm a dedicated Game Dev', by trade, and I'm pretty confident that I can give you the results you're hoping for.
I am relatively new to remote freelancing, so I have aimed my bid a little lower than the average. Please don't mistake this as a sign for low quality, it's just more important to get good feedback than receive significant financial rewards, at this stage.
I'm also happy to supply a single character for your approval, if you would like to get a better idea of my work, reliability and speed of turn-around, just let me know...
...I would be interested to see what visual assets you have already, and how you intend to deploy your game; Unity / Corona / Titanium etc. This will help me get the package and visual style right.
I've been in the gaming industry for many years and I'm comfortable with distributing assets as sprite sheets, moded animations, with retina/HD support etc etc.
I'll leave it there for now, but if you have any questions, or would like me to elaborate on 'any of the above', please don't hesitate to get back in touch.
Best regards
Mark