All weapons with infinite ammunition
The Star Locker contains all weapons with infinite ammunition. To open the Star Locker, break Hank Redwood's records in Leila mode, then complete the game. Note: You may not be able to complete the game normally if the Star Locker is used.

Walk through walls
Find a location with an elevator with a gate-like door. Hold L to crouch, then press A to open the elevator door. You can now walk through any wall on the current level