(I am now in a rush to test as many games as possible to help, so please do not mind the cursory reviewing style.)

Semi-on-the-fly remarks:

Did not expect the drag-and-drop gameplay! :)

says I cleaned up, although there is still one thing (greyish/whitish) on the electronic device.

Planets: It is like a series of riddles/tasks! Original, I like it.

like the rendering of the oscillogram

briefly heard some music or a sound just by tweaking the first button! Is it an Easter Egg?

understood what the arrows are for! :) Spoiler: indicate which way to turn to get the solution.

"UFO is real" makes me think of Fox Mulder’s "I want to believe" XD

the equal signs can be hard to get

nice, voice-over! This is really immersive up to now.

the shotgun line disappears automatically and a bit fast. By the way, great humour. XD

Really varied games, I definitely like the concept! :) It is a bit like "Wario Ware", but with a narrative stream and longer gameplay.

got the shotgun suddenly and put it out because I was acting fast!! Fortunately, counts it as winning! Phew :)

Firing phase: I thought the movement was automatic, but the camera is actually guided by the aiming cursor! Maybe indicate it? (textually or by some other way)

I was not sure about the fact that there are some innocents, the indications were not totally explicit; the fact that there are lives were a hint as a confirmation! :) (Playing once again, discard that: there IS a red cross! Although I think it should be a bit more visible, and also, that the indication could stay longer, or even stay there!)

the scanning-firing phase reminds me of a sequence from the anime "Parasyte" with scanning, those that have seen it will know XD

Made it on my first attempt with 2 seconds left! :D The last two aliens were pesky.

Playing once more to see what the game over will be like. Oh, in the first task, definitely ending right when you click on the greyish thing! Third task: apparently, the sound I got was from getting a first equal sign. Found a trick to rotate the buttons more precisely: put the mouse far away! Fourth task: I did not notice you can also remove the rocks; and great: I see the rifle this time, ANOTHER POSITION, so, random? :D Fifth task: you can apparently get the camera far away from the borders, you would need to prevent this. Voluntary game over (shooting three humans): oh, you cannot play again if you lose?? <:o

Takeaway: this is efficient and interesting, even without taking into account your 48 hours limitation! I found the games varied (I disagree with ZAP21’s comment on the game page!), with the last one having the most gameplay. The connection to the theme is classic; graphics are fair (I especially liked the oscillogram), and sound effects are good. Some details may seem a bit rough because you lacked time, but I really enjoyed the variety and originality!

Great work, especially for such a time frame. :)

PS: I think the white outlines for objects might be a bit big at times, and also, although the sounds are good, some more could be used (for example, for skipping dialogue and for picking up an object).

this is a pretty great little game. was a bit tedious to find the aliens in the last bit, but its all nicely made.

Theres an issue with the ground sprites in that level rendering black lines inbetween them, which could be fixed by using the pixel perfect camera package. 

but yeah, good job