Have to agree with others, jumping seems bit too akward and hard to time which results in unnecessary quick death. About the animations, adding jumping animation would be first step to the right direction.
Graphics were decent, at least they didnt annoy me which is always good. I dont personally see any need to update/change graphics as they do the job just fine.
Good start that can turn into fun game once some tweaking is done, looking forward to play updated version, keep it going :)