I bought the "
Humble Indie Bundle" recently. I've only downloaded World of Goo and Aquaria so far, and the former I've played before, but they're both great games.
Aquaria has got me extremely frustrated - mostly because there are only two more directions for me to explore in, and one of these has the hugest fucking boss that ever shot balls of electricity out of its mouth. The other is too dark to see what's killing you unless you
continually stop to sing and make the little light-fish and light-jellyfish come toward you. Still damn hard though... and it pissed me off when I found
a lit room with a giant boss that looked like an eyeball inside a translucent jellyfish. I got trapped inside, then the
eyeball part started spawning little red jellyfish which attacked me. All this would've been really fun if I hadn't been nearly dead when I arrived there. So of course they killed me... luckily I remembered the recipe for
some soup thing with a German name, which heals 3 hitpoints and gives a speed bonus as well.