Well, you certainly surprised me
After seeing your tank game demo, this is the last thing I would have expected from you. Reading back through the reviews, some of them are pretty harsh. I guess it's just that good ol' NG mentality - my advice: pinch of salt.
Now, the game. The controls are simple, but I found it quite fun. Maybe you should add a status bar which shows any boost-ups/enemies left/levels left - then again, I quite like the clean look, the fact there's no clutter. The graphics were good, and the music wasn't overpowering (suggestion no2 - volume control/jukebox?). Character animation was nice, AS worked a treat.
I'm guessing that the reason that so many reviewers have called it boring is because there's no way to die/lose - so long as you persist, you can win (although it gets bloody hard). I'd suggest having timer that runs down for each level, and 3 lives. Most NG users would probably like it better if more blood was involved, too... sad, isn't it?