My suggestion was deleted? I'm sorry! I didn't mean for it to be a periodic element! I thought that something with the properties I listed or similar would be useful, I just couldn't think of a name that referenced glowing tubes that didn't also reference a periodic element.

Here's some ideas :

1. Napalm - Liquid, extremely flammable, Not pressure sensetive, Providing extremly high temperature when it burns
2. Firework - When it's in contact with fire it will be launched into the air and explode!(if possible it can be in different colours)
3. Dynamite - Solid, Explosive, Not pressure sensetive
4. Player - You control it with the arrow keys, left key - it moves to the left, right key - it moves to the right, up key - it jumps, In contact with fire or high temperature it will die.
5. Side Loop - When a particle gets out of the screen it will get into the screen again from the opposite side.

I guess I should suggest it under a different name then!