Overall, the game has some promise, but it is held back by problems such as lack of health refill, and repetition.
The player only moves around and shoots, with occasional changes to weaponry via item boxes, with no real other tactics.
Then there is the problem with the health refill boxes. Most of the time, the boxes do not work, which makes the difficulty factor of the game that much higher, as one minor mistake on the part of the player, makes the game almost impossible to play without having to start all over again.
When the player upgrades a level, they get 5 additional health points, but the bad guys take at least 8 health points per hit.
Then there is an issue with the Super Knight medal. I have beaten the game twice, and selected available upgrades as they came, and the Super Knight medal is still unreachable.
The background music fits well.
Overall, if the problems were fixed, this game would be in the 4.0-4.5 range, but as it stands, 1.0 is as good as it gets.