really good ones are:

Enigmo
OMGZ
Where is my Heart?
A Space Shooter for 2 Bucks!
1000 Tiny Claws (but the last stages are really really hard)
Scary Girl

I got all of them through Plus.

Velocity
Nom Nation
Where is my Heart?
Floating Cloud God Saves the Pilgrims

Edge, Mecho Wars, Fieldrunners

You know, there's going to come a time, where you say, "What? 75 cents short?!" And, you'll wish you didn't waste money on that crappy indie game you don't even play anymore..

I'd never spend more than 95 cents on any of them. After getting Pixel Junk Monsters on sale with two other games, for 3 dollars, I'm satisfied, and will never get another mini game. But, of course.. the sale has long ended, and now, PJM is back up to 9.99...

But, again, I personally wouldn't waste it. Find a decent demo or something to play if you really need to.

The Impossible Game

I played through that in training mode, but I would never try to in normal mode lol. A bit of a shame I didn't get to hear the real songs like that though.

....um....good Minis?....hmmm....*thinking hard*....
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A Space Shooter for 2 bucks...
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Shogi was decent...
...monopoly?....

I can not think of any good minis tbh. If I had that money I would save up for ps1 classics like FF6 or FF9 or chrono cross.

Speedball 2 Evolution is another good one.

This seems perfect for you

http://www.officialplaystationmagazine.co.uk/2012/07/09/the-best-ps-minis-10-games-for-less-than-30/