Yes there are those arrows in the screen, also it's a mobile game not a pc game
Viewing post in RC Cars Racing Demo mobile comments
Then why is it HTML5? You can access this either on mobile or PC. If this is meant for mobile, then include an APK to download since there's less overhead running an app that way instead of inside a mobile browser. And at least accommodate PC players as well and those few people out there who have a gamepad paired to their phone.
Hm. I haven't touched Unity in a long time, let alone for mobile. Guess I didn't think of that.
And yes, a simple switch would be fine, or even an automatic one that hides the touch UI when keyboard/gamepad input is detected and unhides when touch is detected for seamless switching. (The latter situation likely more niche, but I could imagine a mobile user switching between having their device rested on a table al la a Nintendo Switch and then putting their gamepad down to take their phone with them.)