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http://armorgames.com/play/2044/amorphous-plus
Probably one of the most addicting games I've ever played. I've logged about five hours in the last day myself. I didn't have internet last night, so Japaroads threw me a flash drive and told me to play this game. If you'd rather keep the .swf (I don't know if the website I linked to saves your progress), I attached the file*. Just open it with a browser, and be off.
For the full experience, be sure to read about the enemies in the Bestiary, and read all the award descriptions. Also, Bounty Run mode is the shit.
Enjoy!

*I actually didn't attach the file, because it's five and a half megabytes. But, PM me for it and I'll send it to you somehow if you want it. At the moment, I'm too lazy to look for a site that hosts the file.

Amorphous+!

Yeah, I found that game on Kongregate when it was first out, I can say it was no-doubt most addicting game I've ever played.

The time I found out that game, for 2 weeks, I played nothing but Amorphous+.
It's pretty hard to gather all of the 110 achievements, I had 92 though.

Aww man, this game is so awesome.

Yep. But I like it better on Kongregate because then you can also go for badges along with the normal achievements.

That game is so awesome xD
With N, that's the most addictive freeware game I know....