scheme robots

A programming game I'm making
Any feedback is more than welcome
It runs in javascript and html5, and has a scheme interpreter that can't do proper tail recursion.
http://schemerobots.comlu.com/textarea.html
Put the code for each player in the textareas and press submit code.
Example code:
http://bpaste.net/show/hRqvv38dZSc3NtNNezaV/
It is a work in progress, creatures lose hp but don't die yet.

>>3
Oh, sorry, I misread that as can. The language might be a part of the project (in which case, you're probably better off considering them as seperate projects), but have you considered using an existing scheme-in-js?