I'm playing with DragonRuby now [1]. It lacks a lot (but is coming along very rapidly). It's aimed at adults wanting to build real games, but what appealed to me was exactly that the barrier to get started is extremely low compared to most game engines out there. I particularly dislike the IDE-based ones that expects you to learn a custom environment and build a lot of the game visually.
I love GLBasic. It's a basic with types (sort of classes). Also has 3D grafics but I mostly used it for 2D. It's on steam now and can export to several platforms other than windows. It has been around for quite a while, there is little to no bootstrapping needed and it's fast. You can also write inline C if you need more speed. I haven't had the chance to try android export yet but I have seen some people from the community put up things there recently so it does work.
[1] https://dragonruby.itch.io/