Starship Vega V0.0.4

W to accelerate, A,D to turn, space shoots, P pauses, R resets

New features in V0.0.4:

-an intertial system for the player's ship (it has velocity now), and the ship also has flames as it accelerates

-player shots are more evenly spread

-spawn frequency of enemies is correlated with number of enemies killed, so difficulty increases as you progress

-player shots are smaller, enemy shots are bigger

-fixed the reset option so that it resets everything, not just the ship's position (points, number of enemies killed, etc)

-I think I also decreased the spawn frequency of extra lives, but I'm not sure.
#shooter