Finally got around to making that list These are games you can use the 25% voucher on.
Bear in mind some games (particularly EA) have regional restrictions on some, and vouchers can't always be used.
I see Dead Pixels on that list. I just finished it and absolutely loved it. It's a 2D side scrolling shooter, but it was great fun. Pretty short (maybe 2 hours to get through all modes) but it has a lot of replay value. I'd recommend it for $2.99.