You have Netlify’s asset optimization enabled on your site, which is why the JS is served from cloudfront.net. But the asset optimization does touch the .wasm file as it only optimizes some files (JS, CSS, some images.) So likely the wasm_main.wasm file isn’t on Cloudfront, but with the main site e.g. yoursite.netlify.app/js/alien/wasm_main.wasm.
If you turn off asset optimization (for JS at least), does the site work as intended?