This is a classic idea, and the game could be very fun, but there are a few major issues with this game:
1. The first thing i noticed before i even started to play: The post processing effects look so good, and the game overall is really beautiful, but the spikes, the player and everything is just not that well drawn, which makes them not really fit into the world.
Also, the UI is not that good. Use a different font then Arial, you can find really good fonts on websites like Google Fonts. "U ded" isn't the best game over message and the health bar also looks not as good as other things in the game.
2. The player always gets stuck at walls. To fix that, put a Physics Material 2D with no friction on the rigidbody and the collider.
3. I don't know how long i can stop before i die. Maybe at a timer as soon as the player stops moving.
4. I would replace the health bar with a 3 lives system. The fact that you can stand on spikes and walk on them is really weird, maybe make it so that "Is Trigger" is enabled.
I see good things in this game, but it's overall not very polished. I hope my feedback helps you a bit, and it would be really nice if you could check out my submission too. :)