I still feel that the hurtboxes for the Alpha and Gamma metroids should be slightly tweaked to be more forgiving. They still feel slightly more punishing than in the original 1991 version. Currently blasting the metroids with missiles can feel like trying to snipe an arbitrary game object with a bullet rather than impacting a metroid nucleus with splash damage.
The omega metroid nest is also teeming with enemies, which is weird to me. Especially since the final stretch towards the queen is barren similar to the original. The original Metroid II lurches in pace after area 3, and AM2R thankfully remedies this by heavily reworking the game past said point.
Overall a truly excellent remake that mostly does justice to the tone of the original, marred only slightly by metroid encounters that feel slightly finicky-er than their original incarnations. Ice Beam is rather hidden too tbh. Still found it on the second sweep though. Oh yeah AM2R also employs pixel-rotations. Absolutely disgusting.
Great game. I recommend.