Hey, sorry to hear about that. I think the arrow keys and the enter button on the keyboard should always operate the same way despite bindings - if you manage to get into the gameplay, open the menu up, go to controls, and on the bottom click on reset to default and you should be ok.
If that somehow doesn't work, you can find the save data in the following path "C:\Users\{YourComputerUserName}\AppData\LocalLow\FinalScene" (Replacing {YourComputerUserName} with the profile name you logon to windows with). Delete the BiomassDemo folder and that will clear out all your saved data.