Very nice work! I love the block-y (is it voxel art?) art style on the character, and I really like that you save yellow blocks to get upgrades down the road, gave me a good reason to replay it multiple times. Apparently I also can't read, cause I didn't realize till my second playthrough that red blocks healed you, Also a nice touch.
I did have some trouble determining if I hit an enemy, or if they hit me. I also found that using "spin" got me killed more than anything else, but maybe I just needed more practice as I got better with it over time. I got hit a lot while moving down as well, found there wasn't quite enough visible screenspace below me, at least until the smooth movement caught up to the player, if that makes sense.
I like how the levels get bigger each time, but you're also on a short timer each level, so you have to find a fine balance between rushing while being cautious. I also liked the placement of the enemies, I was nervous turning every corner, and there were a few fun moments where I got swarmed, and fighting my way out of it felt really good! I could see this being a really fun mobile game!