I've noticed that you have a Zip file that's the HTML build, for it to be playable in the webpage there is a checkbox that you need to enable where you upload it in the list of files, here's a reference of mine: https://gyazo.com/2a6a592fe1a11204d82cf79ce4854d03. 
I've set its settings to manual resolution but that depends a bit on your build/player settings.

Fun game with nice art and the boss mechanics, and the upgrade system is a nice touch.

The only thing I'd suggest is to improve the text formatting making it more consistent within itself, and taking it through a spell checker for presentation purposes. In example, some phrases started with caps, but some others didn't for the hotkeys list, and you've also used a mix of &, and "or". The amount of text used looks fine, maybe spreading it along the screen.

Cheers, i hope this helps ;)

There was a lot of cool stuff in this. I felt like my skill improved every round along side getting upgrades, which made the overall experience very satisfying. I also liked the art style combined with the sound of dread. Having a silhouette for the main character was a nice tough.

Awesome work, one of the best atmospheres and environments that I've played! You have a knack for creating compelling games!

Really good job on this! Keep making games :)

This was really fun, congratulations! Really impressive that you're solo dev AND you didn't use any existing assets! 

I loved the fast paced action and that there is a progression system, well done!