2D Shooter Tutorial (SaltyLily)

Modifications- Main Change- Change game to win via time survival , and not via enemies killed. Change levels to be built around spawning waves of enemies versus a set amount of enemies at the start. Change game to have "XP" instead of score, and at a certain XP you would get an upgrade, whether its faster bullets, more speed, more health, or something of the sort. Secondary change- make the levels look better than they do now.