OH SNAP! You don't need to worry about looks at all, lol. also, you have a game so far... I have....... a concept art. lol I haven't even started on the game play other than some enemies! BTW, your furry little creatures are cuuute! Might I suggest an outline around them to help with the contrast between them and the tileset?
That's almost an overwhelming amount of areas... Which I guess justifies the monorail lol That last image made me think of the random trainer battles in pokemon. The dude in the grass stops your movement and comes out with some cheesy reference to the oncoming battle like "Either break down or Breakout™!".
I'm just filling in the blanks here lol looks awesome.