By default, in any similar game, saves are deleted when the game is deleted. Which is an issue that some devs try to solve.
Almost from the beginning of the MurMur, all saves are stored separately from the game. From your words, it appears that you've played version 0.6.1 previously and after deleting the game they should've stayed there in the folder that I mentioned above. You can check if there are files to be sure that you haven't deleted them accidentally by yourself after deleting the game. If you played 0.6.1, then you can simply continue with 0.7.