I tried running your project slime demo. 

I could shoot but not move around, tried arrow keys and WSAD, even clicking on the on screen arrows, nothing worked.

I am running Brave Browser on Zorin Linux.

Hope this helps.

Any chance I could get some feedback on my game in return?

https://mercstudios.com/play/startalon332/

I had a quick moment and tried your game on my phone and it seemed to work fine, I don't have much feedback just yet. It was nice, I had fun. I will see if I can fix the controls, if you could try the windows build and let me know if the controls work then that would be very helpful.