Yeah, it's a good idea from a purely educational perspective. Sure, it can become more, but there's a million languages out there so don't expect it to replace C++ or anything like that...
Is writing my own programming language a good idea? It is mainly for educational purposes, but could become more?
I haven't seen any projects like this... you can try, but you've got a lot of free competition.
I have seen some projects like this in the past, and normally the developers sell their cross platform compiler for a lot of money ($1,000+), and their languages are almost always slow and the compiled .exe is often bulky (4MB for an almost empty project?!) would it be realistic to try and sell my finished compiler? (for much much less of course!)
Are you learning?
Am I wasting my time on this? :S
More functional features. Specifically, a good way to mix functional and imperative programming. Pure functional or pure imperative might sound nice in theory, but in practice (particularly for game programming, where speed and code architecture can make a huge difference) are difficult/limiting. Also, the ability to work with C libraries.
What is important to see in a programming language? (Functions, object-oriented, etc.)
Any other general feedback or comments/questions would be great