The game is very addictive. One of the good things is getting new weapons as you progress, it makes you want to play more and find out what the next weapon is, it's a great hook to keep in the game.
One of the things that happened is that:
- The mouse was navigating on my computer and the character didn't rotate 360° (even in full screen) at level 2.
- At level 3, I couldn't shoot at distant enemies (where there is an enemy at each door) and I ended up losing at that level.
But it's a very fun game, congratulations.