-The camera switching sides in mid-air is incredibly annoying and makes the movement feel slippery.
-Needs a restart button.
-Those fish(?) enemies need a bigger trigger zone. Getting past the first one without getting hit is nearly impossible.
No idea how you're supposed to get past the metal wall on level 3. The only solution I can see is jumping inbetween the enemy and the spikes, turning around, and then hooking onto the enemy, but there isn't enough space.