Eversion, a classic platformer is now available on Steam with new "HD" graphics for $2.50 US at the time of posting.

Eversion, for those unfamiliar with it is a game in which you control a lovable character by the name Zee Tee - an orange asterisk with legs and eyeballs - as he travels the land to rescue the Princess of the Flower Kingdom from the Ghulibas of the north.
Zee Tee has a unique superpower - the ability of eversion which allows him to access previously inaccessible areas.
The game features 7 "worlds" for Zee Tee to evert through on the way to his princess. (and one secret one)
The game features hand-drawn pixel art and surprising plot twists throughout.

The free version of the game can be found here.