feat: fix all sizes and styles

frontend/src/css/keyboard.scss

frontend/src/css/main.scss

frontend/src/js/critter.ts

frontend/src/js/fight_scene.ts

frontend/src/js/game_over_scene.ts

frontend/src/js/leaderboard_scene.ts

frontend/src/js/loading_scene.ts

frontend/src/js/main_scene.ts

frontend/src/js/pause_scene.ts

frontend/src/js/player.ts

frontend/src/js/rewards_scene.ts

frontend/src/js/text_styles.ts

frontend/src/js/tutorial_steps.ts

frontend/src/js/welcome_scene.ts