Your pixel art is clean and quite striking, with some lovely attention to detail, the various consoles shooting cartridges was a nice touch. The background particles added some nice movement to stages without being visually distracting, and the shader over the screen gives a fun retro quality.
I found it very tricky with the relatively slow movement speed and one directional shooting, particularly if multiple enemies were able to get close to the bottom of the screen during the boss encounters. Could be related to my skill level at shoot 'em ups though!
The new soundtrack is great, creates a fun arcade-y feel and reminded me of a few old flash games.