Basically you have nested loops (loops within loops) that probably shouldn't be.

Well, sorry it is hard to explain these things and word it well. But if you dont want my advice then I wont give it anymore. Messy code isn't about or like being a stickler for grammar, it will help you easier understand and decipher what the code is doing and why it isn't working.

No offense but your code is a mess, in more than one way. You're mixing label loops and until, keep in mind your code will be stuck within those loops until the condition is met. You likely have one loop going and preventing other inputs. Write clean code and don't overcomplicate your code/loops. To make the sprite go down just put PY=PY+1. PY being in spofs 0,0,px,py.

J.P. That is easy, even in the manual. I think there are a few ways, but try BGCOLOR or BACKCOLOR. Idk something like that just look.

Industry! ;)

You should never avoid something just because it's difficult!

From my understanding gamemaker is much more powerful, and it can be used in conjunction with things like Unity. ie: Enter The Gungeon was made with gamemaker. But SmileBASIC is much easier to use.

The basics are in the built in manual, go through that on your car trip and make sure you understand all of it.

Looks awesome, surely even better in motion. Bet that took some fairly hefty mathematics!

Oh I didn't know. Well for starters, the R, G, and B variables are the red green and blue values. You can alter those and their starting values for different colors. RC is the radius of the circle. Change GX to GX=GX+1 and look at the difference.

Pretty simple really. Elegant code only 17 lines. study/copy this code and study how the variables change. Don't let the triple nested for loop confuse you, thats mostly to fill in the grid row by row, with changes to the rgb values only happening at the end of each row for the gradient effect.

Looks really good! A simple shadow effect, just duplicate it, change the colors, put it behind the original and offset the position.

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Making art/graphics through code is fun!

no if it's even possible you couldn't make a game out of it if it crashes. You can however create mock corruption (methods)

I've been wondering this myself, but even a code like Nathaniel said would't be hard to crack. I may start experimenting with 'mock' encryption. Is it possible to encrypt with SB?

What Sheepy said, you need a unique sprite id for every single sprite.

Technically computers can't do anything simultaneously, unless it's quantum computing! Computers only mimic/simulate this, by switching and prioritizing processes very quickly. So, I'm not really sure it's possible, but I understand, at times I've wanted the same. It depends exactly what you want... perhaps there is a way I don't know of.

@MSW Sorry mate, didn't read your post closely enough at first. And using a for loop is a better way of filling the BG because typically it will be more than one bg tile.

oops, sorry that should be 15 not 13.