JAG is an arcade-puzzle 2D game which runs on Linux and Windows. It is free and opensource.
The aim of JAG is to break all of the target pieces on each level, and to do this before the time runs out. Keep doing this until you have beaten the last level and won the game.
The are two play modes in the game - arcade and puzzle. The difference is - in arcade mode you can get new bonuses for collected items and use all the tools, and in puzzle mode you have only two tools (Hammer and Clock). Also in the puzzle mode level doesn't fail when the time is over, you may continue, but you won't get any bonus points if the time is zero.