very easy, gets slow when there's lots of enemies, sometimes when you're close to the elevator and you move it, it throws you at the far end of the hall.
not one of jmtb02's best
the difficulty doesn't increase with each level... many of the levels are extremely easy, while some are very hard.
there should be an achievement for completing all lvls, not just 18
great game!
I played a lot of the game, got most of the achievements, and then I realised that I have money that I can use to buy upgrades. That made the game A LOT easier! Duh!