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.

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

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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.

The Moon is Bleeding.

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.

A new coat of paint.

Some changes being made to Marble Zone's alterworld graphics

DARK CATHEDRAL