Hello! There is a way to access old versions of any game on itch but it's a bit complicated. Download the itch desktop app, navigate to our game's page, install the correct version for your system (windows or mac), then hit the gear icon in the lower right hand side of the screen, select "manage" on your downloaded game and then "switch to another version" - you'll be able to switch to whatever version of the game you want and see all the differences.
If you do play more of the old version I would love to hear more of your thoughts about what you prefer about it. I appreciate your "I'm loving the current build, but..." but honestly blunt, direct feedback is more useful to me than compliments. It sounds like there are some things you really prefer about the old version and I want to know that so I can design the new version to still have those things! Could you elaborate on the "simplicity and stupid engine building" that you prefer about the first couple of releases?