[feedback] Tunnel Blaster

[techbear]

I've been working on a small 3D arcade game, mostly as an excuse to develop my particles and explosions. I'd love some feedback on this PC DirectX game.

download the installer:
http://www.18giants.com/tests/TunnelBlaster.exe

screenshot:
http://www.18giants.com/tests/tunnelblaster-ss1.jpg

What level did you get up to?

Graphically, what needs the most work?

What was the coolest part?

Thanks!