I checked your game and memory allocation, everything looks fine, looks like its not your fault, please don't use Unity 2017.3 meanwhile, these versions are having issues with some of the unity api's. Bug has been reported to Unity.
I recently tried Leaders Strike & Freefall Tournament porting from one of the latest unity versions and i found the same errors, with both, Webgl and WASM.
There's a discussion going here and one of our internal team members is also a part of discussion.
If you try patch Patch 2017.1.2p4 , your game should work well.