I somewhat agree with @EisenKoubu in that it sounds a bit quiet. Kind of like the backing track overpowered the vocals D:
All-in-all I think it was good, and you got the pitch and tone of the song just right However I feel that your voice feels a bit too light and airy for the song. That goes well with your other covers, like Gentle Jena and Tori no Uta, but I feel that for Little Busters you gotta have some more spunk in your voice.
Though I guess that’s just a personal opinion, so you shouldn’t mind it so much XD