@Mike: Haha yes indeed.
@GameDevGuy: Well yes actually Monkey _is_ a nice solution and Monkey X (so the first one) is still very usable but I doubt it gets any updates anymore. For now this might be ok but when a new SDK comes out which breaks anything this will be odd.
Then there is Monkey 2. I've tested it quite heavily and I'm somehow happy with it. But, the standard IDE is just ... well it's not an IDE at all. For me it's unusable. The language itself is awesome but it's somehow like C#/C++ which raises the question why I should use it when I can do it directly in C++. I have quite a heavily C++ background, I'm doing this by profession for medical devices for 13 years now.
Monkey 2 is cross platform, but Mark did a terrible mistake by splitting the community a second(!) time, in my opinion. You can consider me to be quite a Monkey fanboy (beside the fact that everyone including me told Mark that the name itself is awful - I mean just google for it and you see what I mean), but even I had to acknowledge the fact that the "easyness" is gone. We now have a language which even introduced fancy concepts like Lambdas, something 95% of all typical programmers never will use or even know what it is.
So to make it short: I've followed AppGameKit quite for a while, the days back with v1 I think Monkey X was absolutely superior but Mark decided to do another split so here I am. I'm very fluent with Unity btw, know it in and out but I can assure you, even with the latest Unity 5.6 series and improved 2d build in functionality it's still a mess. AGK2 (and Monkey) run circles around it when it comes to productivity and quick results. I've tested a lot of other engines, and I mean A LOT. Unity (ya, the big one in the room), Monogame (nice one, comes closest to this here I'd say and uses my beloved C#), WaveEngine (Unity clone, C+ too), Godot (nice one too!), Defold (by King), GameMaker:Studio ... just to name a few.
But as I'm a programmer, I don't like editor based drag&drop solutions. So, beside Monkey there's absolutely nothing which comes close to AGK.