Thank You so much for playing and Review :D. I'm developing an update for launch after The rating period, in that update I tried to balance The difficulty to turn The game more challenging, like: fire and Spike traps with different timings, different placements of The traps and The power-ups, maximum life set to 3, dying now has a consequence, etc. The update also includes bug fixes, more polish and localization to pt-BR. Footstep sound is something I originally made but some players said It was a Tiring sound, so I cut It until I think in a better sound. About The movement being linear I don't know exactly what to do about that lol. Thank You so much for your feedbacks again :D
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For footstep you should look into a technique called "random pitch-shifting."
For movement you could make the movement more momentum based, have some acceleration and deceleration to mimic real life movement. There's a lot of different ways to do that so you need to look those up. You could start here.