First of all, if you are going to put this in a zip file its probably better for you to put it in its own independent file first so that its just a bit more convenient to unzip, not a major problem though,
The game looks pretty bad, you had some background at the start, but then after that its just a gray screen, and the music that for some reason only plays on the title is unfitting, but the way it stops when you move on to the first question is just obnoxious, some of the buttons take several presses to do anything, and some of the wrong answers just don't work, instead of sending you back to the start (like they said they would after lvl 3 or 4), they just didnt do anything, there is a shocking amount of spelling mistakes, and also, its obviously based off the impossible quiz game, but what you didnt seem to carry over was that the questions in that game made sense in some sort of abstract way, here some of the questions are straightforward and some of them are just purely nonsensical, a few of the questions were copied from that game in spirit, and the ones that weren't copied just were not good, now i did think the skip the video level was somewhat clever, and the levels were at least unique in and of themselves, and also the game wasn't so long that getting kicked back to the start was annoying, i'd imagine it takes five minutes to complete, but i was only able to start once, and after that nothing let me begin it again.
Now, if it did work properly, i would say its an alright game, i'd give it a 4/10 because even if it wasn't amazing, i did enjoy the questions i was able to do.
I do feel like this wasn't playtested to any great extent, and most of these issues could probably be fixed in about 5 minutes, but if these issues were fixed and you made the questions a little more interesting i think it could be a pretty good game, there was some clever ideas in there that i did see.

Pretty good game, basically anything you can say about contra you can say about this, the level design is a bit minimalistic but it works,
the graphics altogether are decent, the way the characters are pixel art but the background isn't does look a bit strange but its still ok, but in all honesty the ui is very obnoxious, everything up until you start the level is honestly really bad, and it doesnt reflect on how well the actual game runs, the use of the rifle bullet for only the right arrow is confusing, and the weapon select could be a bit more obvious for people who arent familiar with the actual game, its programmed suprisingly well, like i said before the ui made me think the game was going to run horribly but it was very easy to control and there wasnt any lag or anything, but past being well made, it is literally just contra, and to be honest, there isnt that many original content or ideas in this game, that would make me want to play it over the original contra, which not only looks better but has better level design.
Overall, i couldnt really tell if you were trying to port contra to android, trying to make a small project to test yourself, or trying to make an actual game independent of the real contra, so ill give you this, as a port of contra to android, this game is a 6/10 to me, because it lacks out on basically all of the original content from contra, but as its own game? its closer to a 3/10, because its effectively a (well made) copy of contra without most of the good content.

I hope there was no miscommunication, it is clear you are a very skilled programmer and the game was quite good, its possible I judged it harshly for using the contra graphics, I look forward to your next project!