Awesome stealth game! The Metal Gear Solid 1 aesthetic was executed incredibly well! The mechanics feel great and play pretty close to MGS1. I like the animal character designs, they looked great! The music was also well done.
If I had to give some feedback, I felt that the controls could be tightened up. Often I found myself a little uncomfortable with holding a few keys down to try and do multiple actions at once. A controller implementation might help to alleviate this problem.
Regardless, this is an impressive project. It was a ton of fun!