I have not seen your other stuff for your game here (if u have posted them) But I just wanted to comment a few things on ur house
When you work with a small piece like this and deffinatly when u have a lot of lines going on (like the roof) I would probably say that; the more colour you use the worse it will probably turn out.
To begin with the roof. the planks is totally messed up, theyr all facing different directions, which is one reason it looks odd. especially the two top ones that is getting bigger as further away they get. The AA could obviously use some work and there are good threads posted in this forum to help you out with that.
About the palette. You should try looking into complementary colours. Was from the beginning created by the impressionist artists who didnt make a shade just black or a darker version of the colour uve used, but instead looked into other colours you might use for a shade. (I love Monét)
Ive made this edit for you, and added just a fast palette to show you just shortly what I mean:
Hope it helps a bit at least!
Gl with your game