The game is way too easy. The physics, however, seem very random at times - I get vastly different results by doing the exact same thing. You should have someone with working knowledge of English take a look at the game description as well.
Sell/remove piece function. As it is the only way to upgrade existing schematics is to let it blow up and redo everything, or directly overheat specific bits which also has it's risks
Right-clicking will sell anything except for a fuel cell. Does that not work for you? If not, I can't imagine this matters, but, what browser are you using?
Gun often not shooting at boxes (it gets barrels ok) but through them.
Really liking how I can afford an upgrade after almost every run, rather than the standard grind a week for one seen in most driving games.
Yea, I've played this at freeworldgroup.com before and it does that even with the exact same pieces. It sometimes wants them in a specific order that doesn't alter appearance at all.
The last trigger happy achievement is totally out of scope with the others. I (easily) have all the other achievements, but I'm about at 25% on the last trigger happy
 "Curl Up and Fly!"){kind=icon}
 "Humanity Idle"){kind=icon}
 "Magic Circles"){kind=icon}
 "Caravan Beast"){kind=icon}
 "Destination Kepler"){kind=icon}
 "XMatch 2016"){kind=icon}
 "Spaceman Max 2"){kind=icon}
 "Reactor Incremental"){kind=icon}
 "Zombie Derby"){kind=icon}
 "AdVenture Capitalist"){kind=icon}
 "Pursuit of hat 2"){kind=icon}
 "Cover Color Game"){kind=icon}
 "Learn to Fly Idle"){kind=icon}
 "POiSE"){kind=icon}
 "Froggy Cupcake"){kind=icon}
 "Sirtet"){kind=icon}
 "Urban ATV Racing"){kind=icon}
 "Squidy 2"){kind=icon}
 "Shape Matcher"){kind=icon}
 "Dragon's Call II - Beginning of the End"){kind=icon}
Right-clicking will sell anything except for a fuel cell. Does that not work for you? If not, I can't imagine this matters, but, what browser are you using?