Congrats on getting a game completed!
Overall I thought the game was enjoyable, and it speaks to the strength of the Survivorlike formula that with just a few base elements you've got a fun game that can be expanded on pretty easily!
Like others, I had to download the Windows build as I could not get the browser version to maximize.
Some extra polish items could take this game even further. Mainly have the character actually aim while shooting as currently the character seems to be glitching/stuttering - the gunhand just keeps shaking.
One thing I did notice that kept taking me out of the enjoyment was the level up/next level progression. It is so abrupt, with little fanfare that leads into it, and all enemies just magically disappearing that I got a bit frustrated. I think this is a part that can be "juiced up" to make it more enjoyable and ease the player into the next round.
Other than that great job!