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Yes is possible but very difficult 

Then there might be with your case but if possible then try on another pc. Im new to game development and its my first game and I've used unity's new input system. Don't know more what the problem is. I've tried on different PC's but I didn't faced this problem which you are facing. 

Thanks for liking. But WAD keys wok fine for me I've also tried on other some PCs but works well don't know why they are not working for you.

Controls work well I've tried on many PCs but there's no issue. WASD or try up down left right arrow keys for jump and move and for fire press space. Try arrow keys hope that will work.

Not impossible but difficult just jump from last edge when one leg is off from the metal tile plz then will land on next tile.

It has only 2 levels but very difficult