The summer slump is still in full swing if you aren't a StarCraft 2 fan. Most big releases don't start coming out until late September. All the game companies want their game to become the "must have" game of the holiday season. This sucks for us gamers because it means we barely have any new releases at the moment and a bunch of decent games will fall through the cracks during the holidays.
If game companies would pick slow times of the year to release their games they would get a lot more attention from the community. Just look at how much press StarCraft 2 is getting right now because it's the only big game release in months. There's usually another quiet period right after New Year's that would be a great time to generate tons of press attention.
Anyway, if you're looking to fight the summer slump you can look at a bunch of the flash games I've featured lately. I'd also like to point you towards another tower defense (I can't get enough of that genre) that I came across in the past week. The game is Gemcraft chapter 0 and it's surprisingly challenging. If you're looking for a tower defense game where managing your resources is key then check out Gemcraft.
Don't forget to get out and enjoy the outdoors while the weather is nice. Soon enough it'll be winter.