I was a little weirded out by it at first, but quickly got used to it.
The game is balanced (maybe a little too easy) and is fun to play. Maybe the physics need a little polish (the safe felt really heavy to lift but fell slowly), but overall it's pretty good.
One think I think it's missing is increasing difficult. While it's understandable for a jam game, maybe constantly increasing the "screen speed" or lowering the warning on the missiles would improve it.
Good job!