This is great. Nice changes from the LD tutorial and fine to stay close to the design. I like your idea on a hell and heaven mode .. one to put in the bag.
I didn't read the page first and was confused about lvl3 bomb thinking it was a flash kill/dmg everything on screen -- the shot is quite fast.
Very generous with the bombs/upgrades which I really liked .. just using them at 1 2 and 3 .. very cool.
Particle effects are really refined and I think your colours used are great.