meh
the game fights with some serious bugs. every third or fourth bullet won't wound the enemy and sometimes - after you switched the weapon - you simply don't get anything and have to attack the enemies with thin air.
the gameplay is also very repetitive. a bit more feedback could solve the problem (getting achievements for kill streaks, etc.) because in that case a simple gameplay makes perfect sense. it would also be nice to know how many enemies you have to beat to get to the next level.