There are a number of unlockables after satisfying game conditions. These can be unlocked by continuing, and I'm not sure if you need to finish the game using the same character throughout but it's the safest choice.
Unlockable How to Unlock 5 credits Play for 60 minutes total 8 credits Play for 180 minutes total Arcade Mode ++ Complete Arcade Mode Challenge Mode Complete Arcade Mode Challenge Mode ++ Complete Arcade Mode Character - R.A.D Complete Arcade Mode using Ruby Character - Sensei Complete Arcade Mode using Tempest Extra Credits As gameplay time elapses. 5 credits at 60 minutes Female System Voice Complete Arcade Mode using R.A.D Retro Mode Complete Arcade Mode using Sensei Unlimited credits Play for 300 minutes total
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