The advanced version of a popular indie metroidvania, Cave Story+, is free, 100% free to keep, for Windows, in a limited time giveaway offer! Go and get it, since Cave Story+ may normally be costing US$14.99!
Tag: 8-bit
Zillion 3D
Zillion 3D is a standalone, free and highly challenging Wolfenstein 3D mod with characters from the anime Akai Koudan Zillion and pixel art graphics. There are two episodes with ten levels each.
Proto Cuckoo 64
The retro arcade puzzler Proto Cuckoo 64 is free for Windows, 100% free to keep, in a limited time giveaway offer! Enjoy, because Proto Cuckoo 64 can normally cost £1.99!