As others said, I think the gameplay really held the game back (the slow jump and acceleration) since the character couldn't react as fast you want. I had more frustrations with trying to move the character than with the traps themselves.
Also the character and flag seem a bit blurry. Maybe you didn't put their filter mode in the sprite import settings in Unity to Point (no filter). It's always something to remember with pixel art assets.
But I'm really nitpicking, the game was really fun and reminicsent to old flash games. I had a lot of fun despite of the movements, great job!