I know you meant a game where you just have to man the controls to stop the reactor overloading, but for some reason I started thinking about a game that simulates the particles decaying and bouncing off each other.
The hard part of a physics engine is actually the collisions.
Detecting squares and circles colliding is easy, but detecting irregular shapes is more difficult (the only solution I’m aware of is the separating axis/hyperplane theorem).
Then actually reacting to the collision is an entirely different problem - “which direction?”, “how fast?” et cetera.
If it’s gravity you’re after though, I’ve got that part covered: :P
We also tried to add sound effects in Lode Runner, sounds fine in the emulator but on hardware when a sound is playing it just makes an annoying static noise that never stops…
I’d like to make a small suggestion, it might be nice to reset the cursor flashing when it is moved. That way it would be a little easier to see where it is while playing.