Dynamite Jack is a top-down puzzle/stealth game where your character is working through a series of levels attempting to avoid guards' line of sight while getting keys/blowing up obstacles in order to make your way to the exit.
The graphics are clean and the gameplay is simple, but effective. Each level consists of 3 additional goals in a variety of categories (collect certain items, don't kill anyone, kill everyone, etc) which provides some small level of replayability - in some cases, not all three can be achieved in a single playthrough.
The game is fun. Kind of easy, but fun. The only REAL problem I ran into is there were multiple instances where the game did not save progress properly - I beat many levels (in some cases 4 complete "worlds") and the save did not get uploaded to Steam Cloud properly (and it did not keep track of it locally), so I ended up having to redo all that progress. It was quite frustrating. However, for the game itself, it was a good time.
It only takes about 5 hours to complete everything there is to do in the game. Consider that when choosing the price you want to purchase at.