That's a straight 5 from me, dawg. Was it perfect? Depends on how you wanna frame it! I think you had a thing you wanted to do and pulled it off about as well as you could've, any gripes i had are mostly minor.
Player character looks neat, it's interesting that he doesn't have any arms to start. However, as some others noted, he doesn't animate super well. I figured he might move funky in like an alien sort of way, but he's mostly just kind of stiff looking. Which is somewhat faithful to the source material i suppose lol, but even then it could still be pulled off better- i'd also like to see some recoil on the arm when you fire. Since it's a seperate sprite entirely, i think that wouldn't have been very hard to add.
Powerups didn't wow me, and there were only 3, 2 if we're being honest. We're not in full metroid clone territory with them, but a dash and a remote bomb didn't exactly have me intrigued. I'm glad the bomb could knock you around though, at least. (no time)
On that note, keycards aren't exactly my favorite way to handle progression in these types of games, but i understand why it was done, and you pulled em off pretty damn well, so I can't really hold it against you!
Music was good, served its purpose, was evocative but it's not gonna stick with me. Sounds effects were in a similar state, they did what they needed to but were a little lacking. Well mixed, however.
The stretch to, i think it was keycard level 3? was a bit daunting. It was mostly the setup with the deep acid pit near the end, i died like 3 times there or something. Maybe tone down the rate of damage on it a smidge? Or maybe it was just a skill issue. The rest of the game balance wise was fine though.
But yeah, that's all minor shit, the actual content of the game here is phenomenal. TONS of well made assets and visual variety, with a fleshed out feeling setting. Huge entourage of enemies, good pathing, an actual map(though i would've liked the different areas to be different colors?), optional upgrades to find, some really fun environmental gimmicks with stuff like the live wires. Loved it!
edit: Oh yeah, i also how the no download problem, but i was able to get around it by using the itch client.