Added bullet mass powerup
Made powerup spawner spawn random powerup
refactor powreups views into powerup_view
Add shockwave powerup
Added shield powerup
fix planet shield bugs
Make entities collide with shield instead of planet
Make powerup spawner not spawn shield powerup while shield is on
Fix powerup text shoing up when they go out of screen bug
create pixi layout
Add highscore
Made start screen more responsive
Made game more responsive
extracted desktop tutorial from start view to its own view