A first I looked at the graphics and thought "meh". Then I finished six levels, and changed my mind completely!
I like stealth games, so your game was right up my alley. I liked the progression system, which I gotta admit, seems pretty ambitious for a jam game! This also seems like one of the few games in this jam, where you have multiple levels!
The music was alright! The graphics worked for me in the end, it this "2004 flash game" kind of way.
Keep up the good work :)