i listened because this is one of my favourite songs especially when it's used for demos. cute voice, you've got some timing problems but nothing that couldn't be fixed with some work. please keep going with this, if you need help with anything please ask. this sounds like a CV bank, or a VCV bank with a bad oto.ini file. also, your mixing is fine minus timing issues and slightly low volume for the voice. try center panning. i can show you how to do this in audacity or whatever program you're using, if you don't know how.
anyway, please don't be discouraged. i love this bank so far! she is adorable.