J vs DM

3 classes of operators (verbs, adverbs, and conjunctions) with verbs the most basic function that take either 1 or 2 (infix) parameters. Operators allow function composition with a minimum of parentheses.

J also supports multiline functional definitions similar to BASIC/Pascal. Including error handling.

Each built in operator is a C/asm function, and special code further optimizes some operator combinations. Result is optimized C speed from quick parsing. Array orientation parses and compiles a function once, and applies it to all array items.

Still actively developed, but most recent changes have been in libraries and IDE and platform support.
Language is considered "perfected"... though not quite.

Complete core programming functional tools allow writting programs and libraries without imports.

(... within each of the 3 operator classes) makes reading code easier. Very simple parsing rules.

DM and BYOND are constantly being developed and expanded, with feedback from the community, and Lummox as the lead developer.

The BYOND community is helpful, and has been active for decades, so there are many solutions available. You can find many answers in the forums.

Documentation is easy to learn, and can be found here.

Makes networking easy, so you can just make your game.

One of the easiest to learn languages. Similar to Python and C++.