An original game! Hope it makes sense. The first screen is a basic shoot 'em up operation that occurs during the daytime when you can see your opponent. The idea is not to stop the invaders but to clear a space so you can then walk to safety when night falls.
Keys are S and D to move the cannon left and right and space bar to fire. Move a colonist to safety with the ESDX keys.
The mechanics of the game are finished but some additional refinements are required. I have run out of memory for the time being but I think I can make more room by tidying up the code a bit. I have attached a couple of instruction screen options not included in the game as yet due to lack of memory.
Runs in TI Basic and I have developed it on the Classic99 emulator.