Unfortunately, it's not on sale any more, but I've been playing Creeper World. Underneath the modest presentation is a surprisingly interesting game. It's easily worth the $2 I spent. There are
plenty of maps included with the game, as well as a map editor, but you can enjoy millions (over 3.6 million, apparently...) of maps through the random generator.
The random maps, generated with the help of Perlin noise, are surprisingly engaging. Best of all, the random generator uses a date. You can choose the current date and play a new map every day, or you can choose significant dates. My birthday map happens to be rather difficult, I've been trying to beat it for the good part of the day! >_<
I feel bad for anybody who passed on it yesterday. I almost passed on it myself. It's worth noting that the game uses Adobe Air and a key. I'm afraid I didn't bother to check if you needed to be online to verify the key, but it didn't notice any attempt to connect to anything when I put in the key. The game works in Linux well enough, either through Wine or native. In Wine, the game crashed when I tried to play in full-screen, but otherwise worked. In Linux, it added an annoying menu option for itself that I couldn't figure out how to remove while I had it installed, but it was easy enough to install and remove everything.
It should go without saying, but my netbook was more than able to handle it, so no worries there. Be sure to keep an eye out for the next time it goes on sale. I wholeheartedly recommend it!
In the mean time, you can play the browser-based
Training Simulator. It looks and plays exactly like the full game, but with a small sampling of exclusive levels.
There is, of course, no reason not to get Frozen Synapse right now. It's a Humble Bundle, why wouldn't you? As for Bounce!, I just couldn't figure it out. I was trying to bounce a ball off a diagonal wall through a hoop or something, and skipped a few areas, but wasn't able to accomplish anything.