Well, here's the not-quite-done alpha build of Heart of Ice in Monkey. Performs best in IE9. Controls are cursor keys, Z and X. Two player mode, dialogue, audio and misc tweaks are still on the way.
Edit - This is now the beta version. Thanks to Sam, Arran, Sergio, Stephen and Mark for feedback. Also to Sam again for helping me polish and tone down the dialogue.
The game has been tested in Chrome, IE9, Opera, Safari and Firefox. Unfortunately, for whatever reason it doesn't work on Firefox and I can't work out where the problem lies, though since every other browser performs fine I can perhaps be forgiven for blaming Mozilla!
Enemies aim projectile weapons more accurately. Also, you can hold down C to strafe.
There is dialogue all the way through the game, including an ending. Temporary stand-in music and sound effects has been added (mostly from WitchBlaster, the music for that was done by Thinkt). All that's left to add is a new score, two player mode and possibly difficulty levels.
Edit 2 - Want to play the game at your computer's native resolution? Now you can. That said, at least on my computer this absolutely chugs on anything slower than IE9 (which, at the time of writing, is everything).