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That old-school version of Celeste was made by the same developers before the commercial, full-blown Celeste, and you can find it here. They later ported it and included it in Celeste. This is a port of ccleste which in turn is a port of that original Celeste for PC and 3DS.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.