using crosswalk the minimum size is a little less then 20MB because it has to pack in a striped down version of chrome there no way around it. You can try some of the other export methods they can export smaller but for the most part they don't support everything crosswalk does. Really until android 5.0 is widely used crosswalk is the best option.

Also most games are over 50MB now a days on android so it really isn't that big of a deal for most people.

the reason thats happening is your working outside your layout that solid black line is your layout size. Increase your margin size it be able to scroll to them(under Layout size). If you dont need your layout to be that size just increase it to be able to fix your objects.

edit: see you found out by your self. I recommend you go though the manual and read up on the editor and events it can help alot

https://www.scirra.com/manual/1/construct-2

krish from what ive seen works on everything but crosswalk. the easiest way to get it to work is using cranberrygame's plugin its free and works just great and is simple and easy to use

get it here it named Phonegap IAP:

socialpilgrim what Aphrodite was saying is yes your using the xdk, but you're using the old android export(in xdk) and not the New Crosswalk export which will run faster. We know this because of the apk size. So try using the better Crosswalk option in the xdk then tell us how your performance is.

the memory a sprite takes up it based on image size not the size it's shown at

if you mean you want them to test your game then exporting with Node-webkit gives you those options. If you mean opening your project file well you can't Construct 2 only for windows

you should also check out this page https://www.scirra.com/manual/126/system-expressions

thats because the way it currently is set up is it sets is once on start on layout. you need to set it to set text every tick or however much you need it updated(like on change).

Honestly yes its possible to make what your asking, but whether or not you can make it is a different question all together. Because of that we can not answer your other questions. The amount of time it would take and the quality of the game all depend on your skills not Construct 2 (or any other engines) capability's.

— In preferences/autosave there is a option Autosave frequency it now has a option after preview

that says the build was successful. are you sure the build is failing? can you take a screenshot of the build fail screen?

no it shouldn't be that. to get thw log when the build fails there is a link to the log i dont remember what it says(the link) its something like see logs or something