Green Hill Zone
Really liked this one - actually felt like it could've been a bit longer though. : o Also, I'd say not to rely too heavily on the sample to carry your beat - add some more stuff in there : D Make it a bit more meaty - add your spin to an already nice sampling job. I'm sure it'd be awesome.
Robotnic Beat
Pretty cool (nice transition well), but i'm sure a beat like this would sound much better with some kind of rapping going on (its intended purpose I'm sure lol) as stand alone it gets rather repetitive (perhaps the length/lack of change has something to do with that). You used the loop nicely, but I feel like you could've done some more with it - perhaps sampling another part of that boss theme, or even adding more melodic input from your end y'know? However, keep at it bro.