The scenics is great but... it's too easy... BOSSes aren't cool, seems there is no hard weaponary and tactics is always the same, there's no strategic point.
The battlefield is small so it's tactics only in this game.
There is a scrolling mechanism, and if author adds zoom mechanism also, larger fields could be integrated too.
The huge advantage of large field is presence of strategy component in the game!
Once again: near excellent game.
However, there are two things that may do this game better:
1) some possibility to kill guard (if it is, guard could has wider view angle, that's more real)
2) Timing of each level + time-based badges
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