Immediate issue is the massive window size on the browser, on most laptop monitors are 768p and my desktop monitor is 900p and it fit on neither, had to pan over to it. Also ran into an error on first load, gave me "WebAssembly instantiation failed: CompileError: wasm validation error: at offset 44278344: data segment shorter than declared"
That all said, once I did get into the game, good choice of music, was functional and interesting, biggest issues I had were the bullets not following the reticule very accurately, lots of times where I put the reticule dead center and missed by a wide margin, could probably tighten that up. Otherwise, neat idea, well done on submitting, hope you had a blast making it!