Thanks!
When the REWIND bar is full Press Z on the keyboard, select one of the two choices using the arrow keys then Press C to confirm your choice. Unfortunately I couldn't add a pause functionality before the deadline so you'll have to be quick because the enemies can still hit you when REWIND menu is open.
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Completed the game. I was pressing enter before , thanks for telling me its C to select. The game music reminds me of the intro to Smoke some weed by Ice Cube.