Your colors are way to saturated imo, and your ramps could be mixed up if ya wanna reach something more balanced. Lovely scene though 
Cute :D Makes me want a game where all the tetris pieces make a landscape.. I'd be pretty depressing though, what with any communities that formed inevitably getting torn apart whenever you got a line.
Hey, looks nice! You have some banding issues, though; I think it would look a lot crisper if you cleaned those up. If you're not inclined to revisit this, might wanna keep it in mind for the future. This is a great explanation of banding if you're not familiar with it.
this reminds me a lot of the game Young Merlin for the Super Nintendo.