Cheat mode:
Hold [Left Shift] and type one of the following codes :
Result - Code:
All weapons - hhroqtat
Level skip - terhsrer
Repair damage - cchaserq
Cargo - htarsrec
Complete current level - herhsore
Complete all levels - qheroest
Enable all cheats - cheatseq
Triple cargo hold:
Search underwater to the left of the base on the Medieval level to find a 3x Cargo Hold.
Church bonus:
Crash into the church on the Medieval level at high speed to find a power-up.