Fun to play! Although the bullet sounds are a wee bit too loud haha. I do like the ramping difficulty a lot though, with a little bit more polish there's a lot of potential for a arcade game like this. You should definitely come back to this project in the future.
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Since it's a retro style game, I really recommend going all in into nostalgia. Pixel graphics, maybe achieved using a rendering filter of some sort in order to still allow for the freedom of movement and aim present in your game while having a unique pixelated art style. Play really hard into that kind of audience it can be something great IMO.
Aside from the audio, there weren't any bugs I found personally, although I wasn't trying to look for any while playing it. It seems to play just fine!