Great graphics, but the control scheme is horrible. Arrow keys for move, Z X for attacks would be better.
A few errors do seem to be in the collision/pick up box as I too noticed attacks that look like I clearly evaded still landed and gems didn't always seem to register as being picked up despite driving right over them. Despite that it is still some fun so I can't give 0 stars. 2 for a good but flawed effort.
Like the graphic style. It's fun, though I think the collision detection is too sensitive - I keep being destroyed by things I thought I had avoided, sometimes by quite a way.