I tried to keep this as lag-free as possible, and it seems to be working (as long as you have a decent processor >_<). Arrow keys to move, Z to shoot, X to jump, shift to dash, down to duck, hold C and press the arrow keys to lock in place and aim, and up key to aim up. Cheers.
you have chaser. Well, it does NOT chase the enemy so it is just a green peashooter. Credit to sans130907.