Subroutines are quickly introduced; you can write up to two of them, and have the corresponding commands to call them. You can create infinite loops by using the "call" command at the end of a subroutine. The game calls this "recursion", but it's misleading to use that name since there is no concept of a call stack, and when the "return" statement is introduced, it actually goes back to the FIRST call to the subroutine.
All in all, the feeling when playing through the levels is that there's a lot of repetition and you are just using the same technique over and over with nothing more to discover.
There's a free version too if you want to give it a try.
Another similar game worth checking out is Robozzle, which appears to have deeper gameplay thanks to the different way in which it handles conditionals.
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