The keys other than the cursor are very hectict. Sometimes I have to click into the game area, or the game would not accept Q. I pressed ESC, and could not return to the game by pressing it again (m worked, but that's the menu). Definitely needs some work.
I think the pathway that leads to the exit room should be indicated in some way. More than once I ended the level accidentally while still needing to do some stuff for one of the challenges.
As others have said: jumping is horrible and it should be possible to complete (not skip) the text with e.g. space. The text is sometimes strange grammatically (e.g. instead of find A thief, it should be find THE thief). Also, it may be just me, but the number keys don't work at all, so I can't change weapons (Firefox + flash 10.2). They work alright in other games (such as Boxhead), though...
I just don't understand why shooter developers think that it is fun to replay the same level(s) again and again just to get enough money to buy the updates necessary to win the game. IT IS NOT. Have they never played a good shoot'em up, like Tyrian?!
 "Protector IV.V"){kind=icon}
 "Bela Kovacs and The Trail of Blood"){kind=icon}
 "Formula Racer"){kind=icon}
 "Dino Run : Marathon of Doom"){kind=icon}
 "Space is Key"){kind=icon}
 "PRIOR"){kind=icon}
 "Picma Squared"){kind=icon}
 "Not Your War"){kind=icon}
 "Reincarnation: A Taste Of Evil"){kind=icon}
 "Tentacle Wars. The Purple Menace"){kind=icon}
 "Cactus McCoy"){kind=icon}
 "FPA: Sneak Peek"){kind=icon}
 "Abyss Walker"){kind=icon}
 "Vertigo: Gravity Llama"){kind=icon}
 "Coast Runners"){kind=icon}
 "Clarence's Big Chance"){kind=icon}
 "Reactance"){kind=icon}
 "Rizk"){kind=icon}