Shadow the Hedgehog is coming with his USP Tactical and looks from AsuharaMoon's Another Shadow in Sonic 1 and Double Jump from Sonic Megamix, though suggestions are encouraged.

Credit to TheKKM and AsuharaMoon for the original sprites.

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The Moon is Bleeding.

Here's gameplay footage showing the recently added Shadow, Tails Doll (who serves as an optional hard mode, chasing you at the same time as Sonic.EXE) and some of the original level design for Redux Mode. The speed of X and TD are still subject to change.

Metal Sonic is coming with his moveset from Metal Sonic Hyperdrive. Credit to Darkon360 for the sprites.

A new coat of paint.

My main goal for OSF's development right now is improving the physics. I'm aiming for the next release to have 1:1 accuracy to the original game in terms of controls. The collision system has been majorly reworked to this end.

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Some changes being made to Marble Zone's alterworld graphics

Upcoming redesigns for several Alterworld Badniks are in the works at the moment.