So first of all, it does not seem to work properly on Mac Chrome (at least). The arrow keys just did nothing. Then tried with Firefox and that seemed to work.
The game gets very samey fast. It really would desperately need some difficulty progression. Now it's just static same easyish difficulty all the time and just banking on player snoozing and making a mistake. And of course you offer no way of recovering from those mistakes either so the run is bound to end up at some point (and player not feeling great about it).
Another thing it really would crave for is a blood pumping soundtrack to keep company on the dodging journey at least. It should never be underestimated how much even simple sound effects on hit etc add to the feel of actions.
The collision hitboxes seemed a bit unfair. They might be the "actual" size right now but usually in games like these it just feels better and more fair to shrink them down so that the player never feels like they got hit unjustly. Close calls where you make it by the skin of your teeth are awesome adrenaline rushes even though the player actually should have gotten hit. It just feels better to be 100% sure you did mess up when getting hit.
Not much else to write really. The art looked nice and appropriate for the game.
So yeah, the game would need a difficulty curve and spicier scoring mechanic (multipliers etc) and maybe a way to recover health too. Anyways, good job! 👍