I got another question about performance: should i add round( to the actual number (ex, when humidity is calculated) or only to the counter that displays the number in the UI? will any of them affect performance is some way?

It also depends on when and where you are doing the conversion, if you are using humidity in any other calculations (where the decimal points would make a difference), how often you are updating the UI ( hopefully you are only updating thing when they change and NOT every tick...). Converting to it once will only take a tiny amount of time - what you don't want to be doing is converting the same number over and over.

there are a few ways eg floor(number) int(number) round(number)

see https://www.scirra.com/manual/126/system-expressions

there are many ways but probably the easiest is

on space pressed -- player spawn bullet

every 0.1 seconds

so you add a second condition WITH your testing for space pressed.

I hope I'm wrong but I don't think there is a way.

On your opening screen you could request the player to press a button to continue which would activate the joypad - after all it's quite common to see a "Press (a) to continue"

Not normally a good idea to mix physics behaviour with anything else, it can lead to unexpected problems....

Have you tried running in debug mode - are your enemies getting down to a count of zero ? If not is it because you have some off-screen ? (do a start of layout destroy enemies or a destroy outside of layout behaviour ?

any good ?

Not sure if its what you want - all I have done is set up areas where the player can only go left and other areas where the player can only go right...

my first attempt

Are you using platform, bullet, 8 direction or what ? More information needed I think. Can you post your capx ?

Tarkion - are you talking about the capx I posted or one of your own ? If it's yours own can you post it ?

Are you doing anything with layer parallax or scale or scroll to ?

Please post a basic capx that show this ?

add a "for each coin" as a second condition with your "left button clicked on coin"