EDIT: Full version is not flash - it's fullscreen DirectX game with lot's of features. Check this free download first before writing about full version here:
www.enkord.com
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Clash'N Slash is heavilty updated, check things out:
- New rocket weapon (available @ lvl 4)
- Weapons can be switched during play time
- You can upgrade your ship!
- You can build structures on your home planet!
- Gameplay tweaked for more action
- You can play endlessly to get top score (difficulty increased over time)
- Music added

Now it provides more richer gameplay experience similar to offline DirectX version.