I tried adding a bunch of effects into the engine, yesterday, but..
Yikes!!

-=-=-

A lot of Javascript's canvas effects are fun to see working, but boy do they drain the FPS!
I had the site doing plain grayscale embossing of sprites. At half the framerate.
Adding random noise to the screen. At half the framerate.
Adding a circle of light.. At half the framerate.
And much more besides.

All lovely effects, but all SO slow!!
And I've already got the engine adding random noise to the screen at full speed, so that's completely useless.
I can also draw a bunch of alpha'd ovals to produce a circle of light, likely full speed, too.
And the emboss thing only worked based on the direction of light you've hardcoded into the .html file, making it entirely useless.

And it all, of course, depends on your browser.

So, no. All of that stuff got rejected for being entirely useless.
If I was using WebGL for everything, that'd give me much more options, but it would also drain your battery faster. Also, by default, it isn't actually enabled on a lot of mobile devices, so would break the site in multiple ways.

Ho hum..

Meanwhile..

At the very least, I got Skew working on text and sprites. SetSkew x,y
It currently isn't uploaded as I'm trying to work out how to get it working on shapes. .. I'm not too hopeful that that'll work, if I'm honest.

Also, as with all things, your results will be browser dependant.
Some browsers it slows down. Other browsers, the way I tweaked the draw routines, it's actually a little bit faster.
Go figure.

I did notice one thing, yesterday, though, in that if you scale and rotate and skew and alpha, all at the same time, the framerate once again plummets.
Maybe don't do that!!

I'll probably upload the skew command later today. Still needs a bit of tweaking, though.

Meanwhile, Meanwhile...

IT BURNS!!!

// OMG - it splodid!
// by Jayenkai
// Created 2021/8/2

Symbol 0,"06_0_0T0@b9080.9T90?98b0,80_08";

Graphics 1920,1080,2
AntiAlias On
scry=0-128

Repeat
SeedRnd
SetBlend "Normal"
g=Rnd(0.22,0.26)
CLS 50,30,20,g

Gosub Flame

SetBlend "Dodge"
SeedRnd 37171
SetAlpha 0.4
SetSize 8,8
scry=scry-6
For r=0 to 10
	x=Rand(0,1024)+(Sin(Mills()*0.006*(r+4))*140)+(r*378)
	y=Rand(0,1024)+(scry*((r*0.3)+0.3))+(r*200)
	WrapBG x,y
Next

SetBlend Normal
SetParticleSize 64

Flip
Forever


.Flame
SetBuffer BG
SetBlend "Burn"
SetCol 0,0,0,0.08
Rect 0,0,1024,1024

ResetDraw
SetBlend "Light"
SetAlpha 0.3
for m=0 to 16
	h=Rnd(0,30)
	s=Rnd(0.7,1)
	x=Rand(0,1024)
	y=Rand(0,1024)
	for n=0 to 16
		InkRot h,s,Rnd(0.3,0.6)
		Oval x+Rnd(-8,8),y+Rand(-8,8),Rand(6,12),Rand(6,12),128
	next
next
SetBuffer FG
return