Boss Raid

Emoji list (about 205 characters):
💥 Shrink down and fight GIANT house monsters
⚔️ Beat 100 levels of bosses solo or with your squad
🐉 Team up for epic raids with up to 8 players
🏰 Build a fort and raid your friends
🏆 Climb the arena ranks!
Sentence version (about 168 characters):
Shrunk to tiny size, you face 100 levels of GIANT house monsters. Squad up for raids, battle rivals in the arena, raid forts, and prove you're the ultimate Boss Raider!
I'd use the emoji list. It's easy to skim, and every line names something kids already like: bosses, squads, raids, forts and ranks