The presentation here is really top notch - I really enjoyed the main character (especially the same animation), the animated grass, the lighting. Honestly I loved all sound effects too, and the music was godlike - can listen to it all day.
For the gameplay side I have some comments - Not being able to aim fells wrong, especially with vertical enemies with tight corners. Last gun doesn't feel rewarding - too slow. The character fells too heavy while jumping. Not being able to just step on low steps like the save is a bit weird. Also when jumping up to a new section you're teleported to a platform, which feels weird too.
Thankfully I pushed through, and once you have 2 hearts the game becomes maybe a bit too easy - you can literally brute force because of so many hearts spawning from enemies and saving points. I prefer that, as I could enjoy everything has to offer - but with a little more balancing and tweaks, this one could be among the best