Unfortunately I don't think a good palette is your biggest problem right now.
What you've drawn there seems stylistic or far from realistic and it's hard to know where you want to go with this. The red stuff resembles grass, but it's growing down instead of up, and, well, isn't colored like real grass. The yellow ground, is just that, yellow ground, I can't make anything more of it.
Clarify what you intend to create, and that might help us help you more.
For now I'd say just practice, a good palette to just gran and use for practicing is Arne's palette, and it doesn't have too many colors, so color management is necessary, and you will improve a load.
And, I've learned a lot just reading these forums all day, I've hardly ever pixelled or drew anything.. Yet I can safely distinguish between most rights and wrongs. So just keep practicing and studying.
At this point I'm pretty sure that this is some bizarre game that x-death has crafted, to see how much response he can get without posting anything of substance.
Looks like you were right.
-EDIT- You know, this might not be so bad, there are few successful games with similar art styles.. But, your mockup/screenshot wouldn't convince me that it is.