You start out with no movement options other than walk and swim. As you collect orbs, check the Secrets menu in your pause menu to purchase new moves.
Link to Launcher: https://github.com/himham-jak/Jak1-but-Microtransactions/releases/download/Launcher/OpenGoal_with_Microtransactions.exe
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If you have an issue with the launcher, you can download any release version from the right side of this page and follow the instructions on the main OpenGoal repository here: https://github.com/open-goal/jak-project