Little graphics improvements, combined with fundamental chitchattings about weapons and pickups.

Me and Mike had a decisive Messenger session, in order to reach a practicable solution for the weapons/pickups system, looking forward to a playable test level.
Several things has been refined, but the notable change is that the initial weapons now can be considered as a real 4th weapon which can be enhanced along 6 levels. Plain Shot's levels don't look different while changing level, nor they show progress in bullet's power: when enhanced, Plain Shot increases bullets on the screen, simply. Of course it means we need a new system sprite. One new, or maybe two, if we would have one more for the temporary invincibility.

Two sprites are just gone. In facts, I decided to add one frame to both the side shots pickups, and now their pickups look better.
Another little smoothing has been given to the level1 map. There were too many mines at a certain point, that make the gameplay to be too much claustrophobic. Hence, I dropped some...