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As with many shareware era games, cheat codes were designed in since they ostensibly encouraged exploration and increased the replay value. Found this listing of cheat codes on the 3D Realms site - here, the company which grew out of Apogee. So don't know if it's an exhaustive list, feel free to add further if found.
Enjoy!

To enable cheats, press the "Pause" key (you must be in pause mode to type in cheat codes), followed by "imabigcheat". You will hear a bell sound when cheats become enabled as well as see your score disappear. You cannot enter a high score if you cheat.

Cheat Code What it does
GENERAL CHEAT CODES
blast Full powerup of the current main weapon
plasma Selects plasma main weapon (blue wide fire)
pulse Selects pulse main weapon (red stream fire)
cash Mega credits, gives you 5,000 credits.
flames Ship becomes invincible for a short time.
nuke Full nukes; gives you up to 4 nukes
life Extra Life
warpto# Warp to any level in current episode where # is a level from 1 to 9
ENGINES
impulse Gives Standard Impulser
ioniser Gives Hydrogen Ioniser
megapulse Gives Megapulse 2000
gravdis Gives Gravdis 5
SATELLITES
ener Enertron
mine Mineslammer
dyna Dynamo 500
TOP SIDEARMS (These are zeroes, not letter O's)
t00 Removes Top Sidearm
t01 Credit Drone
t02 Plasma Bomb
t03 Evolter
t04 Matter Disrupter
t05 Rebounder
t06 A-Matt Boomerang
t07 Fragmentor BE800
t08 Bi Particle Cannon
t09 Flamer
t10 Ion Cannon
t11 Magnum 3000DX
t12 Dual Laser
t13 Torpedo Launcher
BOTTOM SIDEARMS (These are zeroes, not letter O's)
b00 Removes Bottom Sidearm
b01 Credit Drone
b02 Plasma Bomb
b03 Evolter
b04 Matter Disrupter
b05 Rebounder
b06 A-Matt Boomerang
b07 Fragmentor BE800
b08 Bi Particle Cannon
b09 Flamer
b10 Ion Cannon
b11 Magnum 3000DX
b12 Dual Laser
b13 Torpedo Launcher

Notes

"Customer Cheat" means it's the cheat given out with the registered version of the software.
"Debug Mode" means it's an unsupported cheat mode.
"Tech Parameter" means it's a code that does something, but really isn't a cheat, it's more or less there to help Apogee Customer Support.
"Misc Command Line Parameter" is the same type of thing as Tech Parameter.

Cheat keys are not officially supported by Apogee. If you use the debug keys, Apogee cannot provide any support, since this alters game performance to a state where our standard support comments and issues might not apply. In short, using cheat keys can cause the game to malfunction or crash. Use at your own risk!
As little extension. If you press Pause in the "same moment you explode" and entry flames, then the invincible is permanent. So you must insert the Cheatcode only one time to the begin of a episode.

Second, the last (best) Engine, is very... nervous, because zero inertia and fast acceleration. Watch out with it.

PS.: Sorry for me bad english^^
Vielen Dank DarthChippo, sehr hilfreich :)
There is also a command-line cheat, but it only works in v1.0b. Should GOG update the game to the latest version (v1.1a) it will no longer work.

What you have to do is to open the file "dosboxSTARGUN_single.conf" and add "/dm0de" (without the quotes) behind STARGUN.exe. Once that is done, you can use the following cheats in the game:

F8 Invincibility
Shift+F11 Skips the level
Shift+N destroys all enemies on the screen
5 (from the Numpad) Grants you 5,000 Credits in the shop
How do you pause? I've pressed just about everything on my keyboard but no go. I must have missed something.

Fun game!
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MattGreer: How do you pause? I've pressed just about everything on my keyboard but no go. I must have missed something.

Fun game!
You pause by pressing the Pause key.
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MattGreer: How do you pause? I've pressed just about everything on my keyboard but no go. I must have missed something.

Fun game!
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Gaunathor: You pause by pressing the Pause key.
I'm afraid I do not see a key labeled "pause" on my keyboard. Could you be a bit more specific, please?

Thanks.
Post edited October 06, 2013 by MattGreer
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Gaunathor: You pause by pressing the Pause key.
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MattGreer: I'm afraid I do not see a key labeled "pause" on my keyboard. Could you be a bit more specific, please?

Thanks.
Keyboards have a "Pause" key in the upper right hand corner. Mine says "Pause/Break".
/smacks forehead

Apologies to all.

I SWEAR I hit every key on the stupid keyboard. But, I must not have. :/
Thanks for the codes :)