~ Good game! I don't think the graphics needs to be improved further (current graphics is enough for me). What I would suggest however, is that try to focus on adding more to the gameplay:
1. More choices
2. More things to interact with/to
3. More situations you can get into
In short: More things to see!
Once those are done, then you can focus on making it an eye candy.
Overall, 4/5 stars 'cause it's incomplete, but you're on the right track my friend. Good luck!