for skills: show what the skill does BEFORE it's purchaseable, and also show requirements for it - i CAN just find out by buying them, and then resetting my points, but it's rather wasteful of mouse clicks!
argh! needs confirmation on selecting Quit! paused the game, did something else, clicked back on the game window to restore focus... have to do level 7 *again* :/
also (either because you keep re-uploading the game or this is broken) progress doesn't get saved - i've got no achievements or completed levels whenever i come here to read your latest response.
as for stencyl - it's not their bug, it's your incorrect usage or implementation. fix it or work around it.
yaw controls make this better, but it still doesn't handle anything like a realistic plane. remember that a normal plane always tries to go up (but gravity pulls it down, which is why it goes straight) - if you turn, gravity still pulls you down, but the upward motion now becomes sideways motion (which is why real planes don't yaw, but roll to turn). consider implementing better physics into the thing.
Q+E don't appear to work... generally when an aircraft rolls (A+D), it also turns in the same direction - adding this would simplify controls considerably
glitchy collision detection with blocks, etc - can land in the middle of a block if moving sideways when falling down. also probably why the jumpy things don't work.
 "Laser Force Version 2"){kind=icon}
 "Outpost:Haven"){kind=icon}
 "Mambo Adventure"){kind=icon}
 "Ring Racer"){kind=icon}
 "My \"Dear\" Boss"){kind=icon}
 "The Laser Gang's Revenge"){kind=icon}
 "Super Mario - Save Sonic"){kind=icon}
 "bubble elements"){kind=icon}
 "TicTacToe"){kind=icon}
 "The Legend of Newgrounds"){kind=icon}
 "epidemic"){kind=icon}
 "Hitman Madness Mod"){kind=icon}
 "Operation Black Sand"){kind=icon}
 "Snake God"){kind=icon}
Its Not a Bug, so I'm Making More Levels and Also Achievements and then do save and load.