Firstly Im not against Scirra... and not the kind of fanboy who blindly follow their favorites.
No matter what they do! And frantically posts long replies and dumb questions just as a bad attempt to defend whats wrong.
You know how a team works ?
When you talk, listen to criticism/suggestion and do whats best for everyone.
Sorry but if 
newt have checked before posting, I would have not been explaining this:
So, Unreal does 2d?
Yes, It Does !
So Unreal does mobile?
Well, here are the platforms that unreal support, maybe you find your answer here:
iOS, Android, Windows, HTML5, Oculus, SamsungVR, PS4, XboxOne, Nintendo Switch, Steam, Ubuntu, Daydream
And more.... Phew !
So does anyone know what 5% of 3000 x 4 equals?
Sorry, let me Elaborate this: If you make upto $3000 in a quarter, you pay Nothing !
Anything you earn more than that in a quarter, you need to pay 5% of that.
Does anyone want to go looking for developers that decide not to pay when they succeed?
Well, if im making more than $3,000 a quarter, I would pay them their share even before they ask.
Now, someone will say Im Unreal's marketing manager... lol
( — has already told me to get lost to unreal... yeah? This is how you will defend it)
And to rephrase correctly what you said, "up until construct 2", it had been standing strong against stencyl or game salad if I may mention them.
Again, as construct is a light weight games and apps creator, and users are mostly not coders/developers.
This shows that not everybody is earning from their creations, most of the users are creating stuff just to promote themselves, their business.. or even just as a hobby.
You need to be a giver first before you expect to be a taker.
Lastly: If you don't want to take suggestions or criticism and don't want to work on it... Why have a community ?
Should open a ticket system.
I was going to suggest few options which can be beneficial to everyone, but I guess 6 men can climb the mountain without any support. Good luck.