I believe there's a little glitch. If you max out level/points and then reset skill points from the blacksmith, it gives you an extra point. Then when you try to play, it keeps insisting you have unspent skill points and will not allow you to continue until you have spent the point... which you cannot spend because all of the skills are maxed out.
Meh. It's kinda fun... not the best example of the genre. The shot system is pretty challenging, which is fun for a bit, but then it just gets annoying. And the upgrades are a little too tough to get.