This is a great game, if a little easy. The only thing that let it down for me was the boss, there was no strategy to it, you just kept shooting and respawning.
If you make a sequel, maybe up the difficulty in the main levels and make the boss more fun.
I loved the physics kills too, but again the AI is prone to suicide, making it an easier option to sit back and wait for enemies to kill themselves.
They had to fight these in ancient Japan you know. They had to develop real-time weapon switch to flip them over and attack their weak points for massive damage.
Kay, I think we've all established this game is TERRIBLE. It was alright for the engine at the time, now we can custom code etc.. I think you'll actually like the game I'm currently making.