It was fun and exciting to play. The visual style looks cool and futuristic.
I had some problems with the movement, I got stuck and couldn't move until I jumped or pressed another key. Also, sometimes when I tried to upgrade my weapon, it glitched and restarted the upgrade's animation itself. Besides that, when I was moving and started shooting, I couldn't move. I don't know if this was made on purpose, but I spent most of the time jumping and shooting while I was moving to avoid this.
At last, It might be a bug, but when I came with the boss, It didn't do anything. I just shot it, and the game ended.
I enjoyed the weapon upgrades; however, I think it could be better if you were able to swap between weapons by yourself instead of automatically swapping when the ammo runs out. I didn't know that there was a sniper after the laser until I played it for the second time.
Overall, I think this is a great game! I can see your effort and the result of a well-done work.