Cheats
Bring up the console with the ~ key then type "iamtheone" to enable cheats. 
Now enter one of the following codes: 

god - Invincibility 
fly - Flight Mode 
ghost - ghost mode 
playersonly - Freeze Bots


More money
To get more money pres the PAGE UP key with each pres you will have 
1000 more money.


Monster Summons
From the drop down console (~) put in iamtheone to enable cheats and type: summon unreali. 

warlord 
titan 
stone titan 
squid 
slith 
skaarj 
skaarjwarrior 
skaarjscout 
skaarjlord 
skaarjberserker 
skaarjassassin 
iceskaarj 
skaarjtrooper 
skaarjsniper 
skaarjofficer 
skaarjinfantry 
skaarjgunner 
queen 
pupae 
nali 
nalipriest 
mercenary 
mercenaryelite 
manta 
giantmanta 
cavemanta 
krall 
lesserkrall 
krallelite 
gasbag 
giantgasbag 
fly 
devilfish 
cow 
babycow 
tentacle 
brute 
lesserbrute 
behemoth 
bots 
skaarjplayerbot 
humanbot 
malebot 
maletwobot 
malethreebot 
maleonebot 
femalebot 
femaletwobot 
femaleonebot 
nalirabit 
horsefly 
blobelt 
biterfish 
bird1 
parentblob 
horseflyswarm 
deadbodyswarm 
biterfishschool