Fairly Good!
I liked it, very simple concept though and i've seen it around before. The graphics weren't that great, i think you should work on that. The music quality wasn't the best and i think the sounds you chose were average but maybe could've been better. If you make another one, you shoud make the stealth bar smaller and make the stealth go down slower. It would've been easier if it had've been positioned like a small interface of some sort. Well, apart from those, this was a pretty good game!
Well done!