That's exactly what I imagine a right Trijam game to be: Original concept fulfilling the theme, simple graphics, fancy music etc. Having a second or third level would be nice, but I consider it optional and do not lower the rating because of it.
I just had a problem trying to jump with up arrow key, maybe moving the time with Q/A or Shift/Ctrl or whatever and jumping with up arrow... maybe. But most people won't have a problem with that I think.
Nice work with the planning and time management and everything.