Neptune, you have a decent singing voice. However, I'd love to hear you sing more confidently. Everything was so falsetto-y. I got the feeling that you were holding back a lot.
I think it'd be cool if you re-did some of the songs and really got into it. Sing with music or sing with an ear-in and edit the song in later.
And if you find yourself losing confidence... just think of Usagi from PGSM. She can't sing at all but she literally hops all over the place like a giddy idiot - and it's CUTE.
Kasei ni Kawatte, Oshioki Yo