Beatstar is such a missed opportunity. They have a ton of licensed music and the gameplay is solid - but to monetize the game the devs force you to collect time locked boxes with tickets for random songs with 3 slots. Once the slots are full you can't play the game at all unless you pay to open the boxes sooner - not even already unlocked songs or a practice mode. Any game that puts the core gameplay behind a paywall deserves zero stars.