Sentry is an action/puzzle game where you try to navigate labyrinths filled with nasty aliens. The twist is that you don't have any weapons of your own, rather you have a number of sentry guns that you can move around to try to clear a path through the alien hordes. However, ammo is limited...
This is probably the least finished game I have ever released; my other games on hUb have been more or less complete by the time I got around to releasing them. In the case of Sentry I hope to get more into the collaborative / iterative development model that Spell of Play really stands for.
The basic idea revolves around the idea of making puzzles for you and your friends to play. The puzzle-editor is built right into the game and is accessible who has a Spell of Play account (registration is free).
The next thing that will be added is online high-score capabilities so you can compete against your friends. As usual, any and all comments and suggestions are welcome in the Sentry forums.
I hope you enjoy Sentry!