Fantastic pixel-art game!
I really like how its going, and there present fully working leaderboard
But there is also a small note. As one of the commenters below said, the enemies move faster than the character, and there are situations where the enemy just "Sticks" to the character, it's a little frustrating
Other than that, I would say it's a great game)
A little hint:
Usually problems with movement speed are caused by the fact that the movement logic is in the "Update" method, but in such cases, I would advise to implement the mechanics of movement and speed in "FixedUpdate", (as it is always called about 60 times per second) (if the FPS is higher 60:D)*
You can also try using "Time.DeltaTime", multiplying it by the speed, to get the distance that the object has traveled since the last frame :D
I hope you find the problem and successfully solve it)
By the way, please, check out my game and rate it, from recent update you can play this game in browser and I need to test this feature :) Thanks!