I have three ideas that would make the game more challenging and I think more fun to play.
First I think that the combat skills are far to easy to train and they should be a lot harder, (less experience per hit)
Second I think that the bunny ears are to easy to get, I think that they should either be a lot more expensive or less of a bonus to your stats.
Finally, i'm not sure if this can be done but if it can make the money cap higher.
I think its in the java but it might be able to be changed.
Post your replys and tell me what you think