This is a very cool experiment, this should be standard practice in teaching CS. I'm a little surprised at the limitations of their interpreters, given the fact

This is a very cool experiment, this should be standard practice in teaching CS. I'm a little surprised at the limitations of their interpreters, given the fact that they are 2nd year already - but then again, they were given the task do develop a language for a very specific test case. The absence of support for nested loop/if constructs probably means they didn't write parsers that generate trees, but rather chose to execute scripts line-by-line, right? I'd like to ask you fellow hackers: if you created a toy programming language today, what features would it have?