Great entry and a lot of fun.
First thing I noticed from the screenshots is everything is really cohesive. They style works and everything fits together. Just from looking at the screenshots you can tell what's going on and what the game is about.
The graphics feel very intentional with the deep red colour pallet and slightly retro vibes. Despite being quite harsh (which fits the game) I feel like they are pretty pleasing to look at and don't distract form the game. The added polish really shines with the effects when enemies die, the trails the player and enemies leave and the different movement styles (like the dodging of the mid size ones) adding to the gameplay.
In terms of gameplay I have some good news and some bad news...
The good news is It feels really nice. Having a couple of different enemy types lead to some really nice feeling emergent behaviour. The way the small, mid and big enemies would end up surrounding me and their different attacks working symbiotically really made for some hectic gameplay. The central mechanic of connecting ammo and health was difficult to remember for me at first because I'm used to just approaching games like this as 'spray and pray', but once i was used to it, it really added and element of strategy. I started to plan a route that would let me unload my entire health and be never a battery as soon as I needed it.
The bad news is..... I beat your score! 5350!
Overall it was a really solid entry and a great experience. The enemy behaviour and the fluid gameplay and strategy mixed with fast paced action gave me very ;Geometry Wars' vibes (which i love). Thanks for sharing and great job! 
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Thanks for the great feedback! I am very new to pixel art, so hearing that people like the art fills me with joy
5350 points is cooked though, I don't think anybody else has managed to even crack 5k yet
The play style you adopted was exactly what I wanted the level and enemy behaviour to encourage the player to do. Absolutely stoked that it worked!
