should i play the 0.7.0a build or the debug build for a better experience?

If you are a beginner or just want to play, then download the regular version. But if you want to help the developer fix a dupe bug, then download the debug version and follow his instructions

Also, some bugs have been fixed in the debug version, the list can be found here https://itch.io/t/3555063/debug-07-build