Cheat Engine

[Samurai Lincoln]

Infinite Booster/Jetpack (Works with both booster versions; infinite boosting in all directions with 2.0, not just straight up.)
004C97E0 (Freeze this at a value of 50. Other values may work, untested.)

Infinite Health
004C97C4
004C97CC
^Freeze both of these at the desired HP amount of your choice. Using one without the other can cause graphical glitches, so use them both, and set them to the same value. For true invincibility, I recommend no less than 150 HP, as most one-hit-kills deal around 127 damage.

All the "0"s in the above addresses are zeroes, the number, not O's, the letter.

If you're boosting in one direction and get hit by an enemy or air vent or something, you'll continue boosting in the average of two directions. For example, if you're boosting right and an air vent propels you up even for a split second, you will begin to fly diagonally up and right. This is easily solved by releasing your boost button and tapping it again.

I hope this helped you as much as it helped me! :> Have fun!

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[Fresco]

there's a section where you can upload your cheat table, if you fell like contributing.