Sentry Knight is a defensive shooter like Elona Shooter, only almost aggressively adorable... and significantly shorter. As a lone knight with a bow and arrow in a tower, your job is to hold the line on each stage against the cuddly-wuddly invading forces of darkness. Our hero automatically fires his bow wherever the cursor is, so just use the mouse to aim and he'll take care of the rest. Destroying enemies grants gold to spend on upgrades at the blacksmith, but also experience points towards leveling up, which earns points you can spend on a variety of skills, enhancements, and even devastating spells. You can go back and replay levels to grind for more levels and gold... and you'll probably need to. Sentry Knight's main drawback, in fact, is that it's so short, and that means it feels like the difficulty spikes significantly at level three instead of maintaining a steady slope. The game has such a substantial amount of skills at its disposal, with three hefty skill/spell trees, that it would have been nice to have more time to use and unlock them, rather than feel like you were being forced to grind so quickly.
With about twice as many levels, Sentry Knight would be absolutely stellar instead of grindy, but good. The design is absolutely fantastic, sporting a wide variety of enemies and abilities, and the gameplay is perfect for casual breaks. If it were spread out a bit more and a bit more forgiving, even if simply by allowing you to keep gold and experience if you die, or relying a bit less on swarming you with tons of smaller enemies around one massively powerful one. I like Sentry Knight. Maybe not as much as I could, but I do. It's charming, simple, and addictive. If you don't have the patience for grinding, you're going to have to sigh and bid a tearful farewell with waving hanky on the docks of What Might Have Been, but if you like a challenge and repeatedly shooting things in the face for gold, this one might just be for you.