Totally understand, but FWIW over the years I've gotten plenty of $1-3 stuff that's better than most of the $15-60 stuff and to boot, runs on crappy hardware. One of my best purchases was (IMO) the only AAA tower defense franchise: Defense Grid. I had never even heard of it when I bought it, but it's fantastic. It's $2.50 right now and I played it into the ground on an old 2008 era Athlon x2 7750 with motherboard integrated graphics (and that was well before APUs stepped up iGPU quality).
There's more good stuff out there that probably runs on even the slowest hardware. If you click on the under $5 and sort by lowest price (this way so you don't end up with a long list of F2P games) there are tons of games less than $1, and a shocking percentage of them are well reviewed.
Now that I'm done hypocritically trying to talk you into buying, I think I'll just go replay some stuff I already own :wink: Actually, I haven't played the original Defense Grid in a while. One of the DLC expansions ("You Monster") comes with GlaDOS thanks to a partnership between the devs and Valve. She always cracks me up.