I liked this a lot--really fun. The stealth mechanics were nice and simple, too often these style of stealth games are too fiddly and hard. The level design might need some tweaking, hiding in the doors never felt all that useful. I liked the climbing and the shooting and the design of the different characters--the sprite work in general was really nice. The walking sound effect was super annoying, the game would benefit from a few more different sound effects. Those negatives aside, the gameplay was really fun, it would be nice to see this expanded with more levels and enemies. Nice work! :)