2.1:<br>
- Hold a direction for a second to repeat move<br>
- One new enemy for each colour<br>
- Some enemies no longer move over each other<br>
- Blue Chasers no longer stack<br>
- Different coloured enemies now have unique sprites<br>
- Plain items now sort above red items<br>
- Scroll wheel now switches selected item<br>
- New boss added<br>
- Secret late-game stuff<br>
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2.0:<br>
- Ported to Gamemaker: Studio<br>
- Possibly other changes<br>
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Everything before Studio wasn't documented.