If so, have you seen the weapons systems from the vertical shooting genre? I think awesome weapons would really add a lot to your game – a homing missile gun, an auto-aim laser, orbiting shields, and gradius style pods that chase your ship would be awesome!

Your usage of fire and ice weapons reminds me of Ikaruga, but I feel your cannon weapon sort of does it all and it doesnt force the player to change weapon types a lot. If you force the player to change weapon systems more (i.e. fire does basically no damage to fire, etc) it might make it possible to add even more depth to your already wonderful game.

Thanks again!!