Hey, nice stuff with the game! Even though its simple it seems pretty well executed and the style is pretty cohesive, also the music fits well with the vibe of the game.
Few notes:
The game starts out painfully slow and takes a while to pick up. I ended up playing until 6500~ and at that point it was going fast enough to be difficult to react to, but the game was not engaging up until the speed started to pick up because there isn't much to interact with or react to and the challenge is almost nonexistant. Having only 3 obstacles and all of them be spikes doesn't really help either. Overall I'd say to have the game start up faster or progress through the speeds faster.
There should probably be a sound or bigger visual effect when the shield is popped.
The particles in the game were a bit distracting, but thats more of a nitpick than anything
Overall great job! Love the vibe and the lil dude