OK, here are the screens for those who can't see them and my opinions on each one.
1. The '2' in 2011 has a bad palette.
2. The file select menu will cut off the text where it is now.
3. Use the numbers at the top of the 8x8 tile selector window. Don't mix them with the Nintendo "1990,1991" numbers as they look bad. Also, use the "Home" and "End" keys to change palettes.
The text box doesn't make much sense. Also a different intro level would look better.
This looks flat and boring. Add in some hills, enemies and decorations like bushes.
The note block has a bad palette.
1. Why all the clouds everywhere?
2. Looks flat and boring.
1. Bad note block palette.
2. Looks bland.
If you want to post screenshots in future, then upload to an image hosting site like imgur
and in each picture copy and paste the IMG code here.