itch.io

The pixel art is really good, and the clouds are also pretty nice, but the game itself is kind of lackluster. Everything feels sluggish (the player movement, the projectile speeds, the enemies' movement), there's never too much stuff going on, you just sit there holding space and move every once in a while, but are otherwise safe most of the time. The player projectiles clash with the pixel art, since they're like realistic/lighted up, they could all be done through pixel art as well.
As others have said, the SFX are pretty jarring, in particular the laser SFX. That's not one sound effect, you're overlaying the same effect multiple times until the volume reaches earrape levels, it should be only one looping sound.
The music is also rather odd. The menu has the same melody as the stage, but while the menu has a nice pleasant sound, the stage music is rough chiptune music. I don't see why you couldn't use the same track or something in a similar style for the game itself. And regardless of your resources, you CAN make pleasant sounding chiptune music (for free (or just, you know, acquire the necessary software for free)), it just requires learning how to do so (generally through stuff like Famitracker). The other option you have is using royalty free music of which there's a lot, just requires some searching.