I was impressed at how addicted I got to this. Granted, it's mostly because you can easily get upgrades. It doesn't matter which path you take. Both of them will lead you to the boss. I really hate the laser upgrade. It has to be timed just perfectly.
The sound effects were great. I do remember those old "Commando" games. I thought Double Jump and Coin Magnet were permanent things. At least they're there. Its hard to tell how much damage I'm leaving the final boss with.